86436-42-2 BENZO(a)HEPTALENE-7-CARBAMIC ACID, 5,6,7,9-TETRAHYDRO-9-OXO-1,2,3,10-TETRAMETHOX Benzo(a)heptalene-7-carbamic acid, 5,6,7,9-tetrahydro-9-oxo-1,2,3,10-tetramethoxy-, ethyl ester, (S)- N-Carbethoxydeacetylcolchicine