(5Z)-3,4-diethyl-5-[(4-ethyl-3,5-dimethyl-1H-pyrrol-2-yl)methylidene]pyrrol-2-one

2-[(3,4-diethyl-1H-pyrrol-2-yl)methyl]-3,4-diethyl-1H-pyrrole

3,4-diethyl-1,2-dihydropyrrol-5-one