(6Ar,9R)-N-[(2S)-1-hydroxybutan-2-yl]-7-methyl-6,6a,8,9-tetrahydro-4H-indolo[4,3-fg]quinoline-9-carboxamide;but-2-enedioic acid
A homolog of ERGONOVINE containing one more CH2 group. (Merck Index, 11th ed)