4-[[2-oxo-5-(3,4,8,9-tetrahydro-6-methoxy-3,3,8,8-tetramethylfuro[2,3-h]isoquinolin-1-yl)-1(2H)-pyridinyl]methyl]benzoic acid methyl ester 以62%的产率得到4-[[2-oxo-5-(3,4,8,9-tetrahydro-6-methoxy-3,3,8,8-tetramethylfuro[2,3-h]isoquinolin-1-yl)-1(2H)-pyridinyl]methyl]benzoic acid hydrochloride