Colchicine EP Impurity C

Chemical Name: N-[(7S,7bR,10aS)-1,2,3,9-tetramethoxy-8-oxo-5,6,7,7b,8,10a-hexahydrobenzo[a]cyclopenta[3,4]cyclobuta[1,2-c]cyclohepten-7-yl]acetamide (as per EP)

Smile: CC(N[C@@H](CCC1=CC(OC)=C(OC)C(OC)=C21)C3=C2[C@](C=C4OC)([H])[C@@]3([H])C4=O)=O