(Z,Z)-3,6-Dihydro-5-methoxy-3,6-bis(phenylmethylene)-2(1H)-pyrazinone 111451-12-8 2(1H)-Pyrazinone, 3,6-dihydro-5-methoxy-3,6-bis(phenylmethylene)-, (Z,Z)- 3,6-Dibenzylidene-2-methoxy-3,6-dihydropyrazin-5-one Neihumicin