5-[5-[1-{5-[1-(3,4-Dimethyl-1H-pyrrol-2-yl)-meth-(Z)-ylidene]-3,4-dimethyl-5H-pyrrol-2-yl}-meth-(Z)-ylidene]-3,3-dimethyl-pyrrolidin-(2Z)-ylidenemethyl]-2,3,3-trimethyl-3,4-dihydro-2H-pyrrole-2-carbonitrile 在
potassium tert-butylate 、
三氟乙酸 作用下,
生成
nonamethyl-C,D-tetradehydrocorrin