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3-Demethylcolchicine O3-Demethylcolchicine 3-DesMethylcolchicine 3-O-Demethylcolchicine (-)-3-Demethylcolchicine Colchicine EP Impurity E (-)-3-Demethylcolchicine Colchicine 3-Demethyl Impurity Colchicine Impurity 5（Colchicine EP Impurity E） Colchicine EP Impurity E (3-O-Demethyl Colchicine) (S)-7-Acetylamino-6,7-dihydro-3-hydroxy-1,2,10-trimethoxybenzo[a]heptalen-9(5H)-one N-[(7S)-3-hydroxy-1,2,10-trimethoxy-9-oxo-6,7-dihydro-5H-benzo[a]heptalen-7-yl]acetamide (S)-N-(3-hydroxy-1,2,10-trimethoxy-9-oxo-5,6,7,9-tetrahydrobenzo[a]heptalen-7-yl)acetamide N-[(7S)-5,6,7,9-Tetrahydro-3-hydroxy-1,2,10-triMethoxy-9-oxobenzo[a]heptalen-7-yl]-acetaMide Acetamide, N-[(7S)-5,6,7,9-tetrahydro-3-hydroxy-1,2,10-trimethoxy-9-oxobenzo[a]heptalen-7-yl]- N-[[(7S)-3-Hydroxy-1,2,10-trimethoxy-9-oxo-5,6,7,9-tetrahydrobenzo[a]heptalene]-7α-yl]acetamide