3,3'-(3-ethyl-2,7,13,18-tetramethyl-1,19-dioxo-17-vinyl-19,21,22,24-tetrahydro-1
H-bilin-8,12-diyl)-di-propionic acid dimethyl ester 在
氢氧化钾 作用下,
生成
3,3'-(3-ethyl-2,7,13,18-tetramethyl-1,19-dioxo-17-vinyl-10,19,21,22,23,24-hexahydro-1H-bilin-8,12-diyl)-di-propionic acid