2-Butenedioic acid (2Z)-, esters with 2,2'-iminobis(ethanol) N-(C6-18 and C18-unsatd. alkyl) derivs. 2-Butenedioic acid (Z)-, esters with 2,2'-iminobis(ethanol) N-(C6-18 and C18-unsatd. alkyl) derivs. 68987-58-6