Acetamide, N-[4-cyano-5,6,7,9-tetrahydro-1,2,3-trimethoxy-10-(methylamino)-9-oxobenzo[a]heptalen-7-yl]-, (-)- Benzo[a]heptalene-4-carbonitrile, 7-acetamido-5,6,7,9-tetrahydro-1,2,3-trimethoxy-10-(methylamino)-9-oxo- NSC99421