9-acetoxy-8-(7'-(9'-acetoxy-3',3'-dimethyl-7',10'-dioxo-7',10'-dihydro-3'H-naphtho[2,1-b]pyran-8'-yl)-5',8'-dioxo-5',8'-dihydroquinolin-6'-yl)-3,3-dimethyl-3H-naphtho[2,1-b]pyran-7,10-dione 在
lithium hydroxide 作用下,
以
四氢呋喃 为溶剂,
以67%的产率得到9-hydroxy-8-(7'-(9'-hydroxy-3',3'-dimethyl-7',10'-dioxo-7',10'-dihydro-3'H-naphtho[2,1-b]pyran-8'-yl)-5',8'-dioxo-5',8'-dihydroquinolin-6'-yl)-3,3-dimethyl-3H-naphtho[2,1-b]pyran-7,10-dione