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Structure	Chemical Name	CAS	MF
	2-[(2E)-but-2-enoylamino]propanoic acid		C7H11NO3
	1-[(2E)-but-2-enoyl]piperazine		C8H14N2O
	2-[(2E)-but-2-enylthio]aniline		C10H13NS
	2-[(2E)-but-2-enoylamino]-5-chlorobenzoic acid		C11H10ClNO3
	1-[(2E)-but-2-enoyl]-1,4-diazepane		C9H16N2O
	E-2-BUTENOICACID3-(DIETHOXYPHOSPHINOTHIONYL)ETHYLETHER		C10H20O10P2
	2-({[(2E)-but-2-enylamino]carbonyl}amino)-2-methylbutanoic acid		C10H18N2O3
	2-({[(2E)-but-2-enylamino]carbonyl}amino)-2-cyclopropylpropanoic acid		C11H18N2O3
	2-({[(2E)-but-2-enylamino]carbonyl}amino)-4-methylpentanoic acid		C11H20N2O3
	2-[(2E)-but-2-enoylamino]benzoic acid		C11H11NO3
	2-[(2E)-but-2-enoylamino]-4-fluorobenzoic acid		C11H10FNO3
	2-[(2E)-but-2-enoyl]-1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid		C14H15NO3
	1-[(2E)-but-2-enoyl]octahydro-1H-indole-2-carboxylic acid		C13H19NO3
	2-({[(2E)-but-2-enylamino]carbonyl}amino)-2-phenylpropanoic acid		C14H18N2O3
	(E)-2-BUTENEDIOIC ACID AND ETHENYLBENZENE)	116048-67-0	C17H20O6
	(2E)-2-Butenedioic acid polymer with 1,2-ethanediol and 1,6-hexanediol	117601-69-1
	(E)-BUT-2-ENYL-SS-D-FRUCTOPYRANOSIDE
	2-[(2E)-but-2-enoylamino]-3-methylpentanoic acid		C10H17NO3
	(E)-2-Butenedioic acid polymer with 1,3-dihydro-1,3-dioxo-5 -isobenzofurancarboxylic acid, α, α'-[(1-methylethylidene)di-4,1-phenylene] bis[ω-hydroxypoly(oxy-1,2-ethanediyl)] and α, α'-[(1-methylethylidene) di-4,1-phenylene]bis[ω-hydroxypoly[oxy(methyl-1,	116736-81-3	(C9H4O5.C4H4O4.(C3H6O)n(C3H6O)nC15H16O2.(C2H4O)n(C2H4O)nC15H16O2)x
	1-({[(2E)-but-2-enylamino]carbonyl}amino)cyclohexanecarboxylic acid		C12H20N2O3
	1-{3-[(2E)-but-2-enyloxy]phenyl}ethanone		C12H14O2
	（E)-2-Butenedioic Acid Mono-ET Ester Of Food Preservation And Fumigant Insecticide
	1-{4-[(2E)-but-2-enyloxy]-3-methoxyphenyl}ethanone		C13H16O3
	1-[(2E)-but-2-enoyl]-4-hydroxypyrrolidine-2-carboxylic acid		C9H13NO4
	2-[(2E)-but-2-enoylamino]-3-methylbutanoic acid		C9H15NO3
	2-[(2E)-but-2-enylthio]benzoic acid		C11H12O2S
	3-[(2E)-but-2-enylthio]propanoic acid		C7H12O2S
	1-[(2E)-but-2-enoylamino]cyclohexanecarboxylic acid		C11H17NO3
	Crotylamine	56930-04-2	C4H9N
	Diethyl fumarate	623-91-6	C8H12O4
	trans-Methyl crotonate	623-43-8	C5H8O2
	(E)-2-Butenoyl chloride	625-35-4	C4H5ClO
	(E)-1-(But-2-en-2-yl)cyclopropanamine	885268-23-5	C7H13N
	2-[(2E)-but-2-enoylamino]-3-hydroxybutanoic acid		C8H13NO4
	2-[(2E)-but-2-enoylamino]-4,5-dimethoxybenzoic acid		C13H15NO5
	2-[(2E)-but-2-enyloxy]benzoic acid		C11H12O3
	3-[(2E)-but-2-enyl(phenyl)amino]propanenitrile		C13H16N2
	1-[(2E)-but-2-enoyl]piperidine-3-carboxylic acid		C10H15NO3
	{4-[(2E)-but-2-enyloxy]phenyl}acetonitrile		C12H13NO
	2-[(2E)-but-2-enoylamino]-5-fluorobenzoic acid		C11H10FNO3
	2-[(2E)-but-2-enoylamino]-3-(1H-imidazol-4-yl)propanoic acid		C10H13N3O3
	(E)-1-(BUT-2-EN-2-YL)CYCLOPROPANAMINE		C7H13N
	(E)-1-(BUT-1-ENYL)CYCLOPROPANAMINE		C7H13N
	((E)-BUT-1-EN-3-YNYL)-BENZENE	146276-26-8	C10H8
	1-[(2E)-but-2-enyl]piperidin-4-one		C9H15NO
	2-[(2E)-but-2-enoylamino]-5-methylbenzoic acid		C12H13NO3
	1-[(2E)-but-2-enyl]piperazine		C8H16N2
	1-[(2E)-but-2-enoyl]-4-methoxypyrrolidine-2-carboxylic acid		C10H15NO4
	(E)-BUTEN-3-YNYL-2,6,6-TRIMETHYL-1-CYCLOHEXENE	73395-75-2	C13H18
	3-[(E)-2-BUTENOYL]-1,3-OXAZOLIDIN-2-ONE	109299-92-5	C7H9NO3
	2-({[(2E)-but-2-enylamino]carbonyl}amino)-4-(methylthio)butanoic acid		C10H18N2O3S
	2-[(2E)-but-2-enyloxy]benzonitrile		C11H11NO
	2-[(2E)-but-2-enoylamino]-3-phenylpropanoic acid		C13H15NO3
	2-({[(2E)-but-2-enylamino]carbonyl}amino)propanoic acid		C8H14N2O3
	3-[(2E)-but-2-enoyl]-1,3-thiazolidine-4-carboxylic acid		C8H11NO3S
	2-[(2E)-but-2-enoylamino]-3-(1H-indol-3-yl)propanoic acid		C15H16N2O3
	1-({[(2E)-but-2-enylamino]carbonyl}amino)cyclopentanecarboxylic acid		C11H18N2O3
	3-[(2E)-but-2-enyloxy]benzaldehyde		C11H12O2
	2-({[(2E)-but-2-enylamino]carbonyl}amino)-3-phenylpropanoic acid		C14H18N2O3
	1-[(2E)-but-2-enoyl]piperidine-2-carboxylic acid		C10H15NO3
	5-[(2E)-but-2-enylthio]-4-methyl-1,3-thiazol-2-amine		C8H12N2S2
	5-[(2E)-but-2-enylthio]-1,3-thiazol-2-amine		C7H10N2S2
	5-[(2E)-but-2-enoylamino]-2-hydroxybenzoic acid		C11H11NO4
	7-[(2E)-but-2-enoylamino]heptanoic acid		C11H19NO3
	6-[(2E)-but-2-enoylamino]hexanoic acid		C10H17NO3
	(E)-1-(But-1-enyl)cyclopropanamine	885268-19-9	C7H13N
	1-((E)-BUT-1-ENYL)-3-ETHYL-5-METHOXY-1H-INDOLE		C15H19NO
	(E)-but-1-enyldiethylaluminium	68900-85-6	C8H17Al
	(E)-2-butenyl acetate	7204-29-7	C6H10O2
	4-{[(2E)-but-2-enoylamino]methyl}benzoic acid		C12H13NO3
	4-[(2E)-but-2-enoylamino]-2-hydroxybenzoic acid		C11H11NO4
	4-{4-[(2E)-but-2-enyloxy]phenyl}-1,2,3,6-tetrahydropyridine		C15H19NO
	4-[(2E)-but-2-enoyl]-3,4-dihydro-2H-1,4-benzoxazine-2-carboxylic acid		C13H13NO4
	4-[(2E)-but-2-enylamino]butanoic acid		C8H15NO2
	4-{4-[(2E)-but-2-enyloxy]phenyl}butan-2-one		C14H18O2
	4-[(2E)-but-2-enyloxy]-3-ethoxybenzaldehyde		C13H16O3
	4-[(2E)-but-2-enyloxy]benzonitrile		C11H11NO
	4-[(2E)-but-2-enyloxy]-3-methoxybenzoic acid		C12H14O4
	4-[(2E)-but-2-enoylamino]butanoic acid		C8H13NO3
	4-[(2E)-but-2-enyloxy]-3-methoxybenzaldehyde		C12H14O3
	4-[(2E)-but-2-enoylamino]-3-methylbenzoic acid		C12H13NO3
	4-[(2E)-but-2-enyloxy]-3-methoxybenzonitrile		C12H13NO2
	4-[(2E)-but-2-enoylamino]benzoic acid		C11H11NO3
	4-[(2E)-but-2-enyloxy]benzaldehyde		C11H12O2
	4-[(2E)-but-2-enyloxy]benzoic acid		C11H12O3
	(E)-but-2-enal	15798-64-8	C4H6O
	3-[(E)-but-1-enoxy]propane-1,2-diol	63991-93-5	C7H14O3
	1-[(2E)-but-2-enyl]piperidin-4-one oxime		C9H16N2O
	4-[(2E)-But-2-Enyl]-2,6-Dimethyl-6H-1,3,5-Oxathiazine		C9H15NOS
	(E)-BUT-2-ENYL-BETA-D-FRUCTOPYRANOSIDE		C10H18O6
	3-[(2E)-but-2-enoylamino]propanoic acid		C7H11NO3
	2-({[(2E)-but-2-enylamino]carbonyl}amino)-2-methylpropanoic acid		C9H16N2O3
	2-[(2E)-but-2-enoylamino]-4-(methylthio)butanoic acid		C9H15NO3S
	{4-[(2E)-but-2-enoylamino]phenyl}acetic acid		C12H13NO3
	2-[(2E)-but-2-enoylamino]-4-chlorobenzoic acid		C11H10ClNO3
	3-[(2E)-but-2-enyloxy]benzonitrile		C11H11NO
	1-[(2E)-but-2-enyl]-1,4-diazepane		C9H18N2
	(E)-2-Butenoic acid 2-[N-heptyl-N-(2-hydroxypropyl)amino]ethyl ester
	(E)-2-Butenoic acid 2-[N-butyl-N-(2-hydroxyhexyl)amino]ethyl ester
	(E)-2-Butenoic acid 1-(hydroxymethyl)-2,3-dihydroxypropyl ester		C8H14O5

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