6'-hydroxy-4',9'-dihydro-N,N-dimethyl-4-butyl-spiro[cyclohexane-1,1'(3'H)-pyrano[3,4-b]indol]-4-amine 、
柠檬酸 以
乙醇 为溶剂,
以72%的产率得到6'-hydroxy-4',9'-dihydro-N,N-dimethyl-4-butyl-spiro[cyclohexane-1,1'(3'H)-pyrano[3,4-b]indol]-4-amine 2-hydroxy-1,2,3-propanetricarboxylate