Iryanthera paraensis and I. tricornis (Myristicaceae) both contain in their trunk wood 1-(2' ,4'-dihydroxyphenyl)-3-(2"-methoxy-4", "-methylenedioxyphenyl) -propane (1a),1 -(2',4'-dihydroxyphenyl)-3-(3", 4"-methylenedioxyphenyl)-propane (1b) and 1- (4'-hydroxy -2'-meyhoxyphenyl-3-(4"-hydroxy-3"-methoxyphenyl) -propane (1c). Only from the former species 1- (2' ,4'-dihydroxy-3' -methylphenyl) -3- (2"-methoxy-4",5"-methylenedioxyphenyl) - propane (1d) and 1-(2'-hydroxy-4'-methoxyphenyl)-3-(3",4"-methylenedioxyphenyl)-propane. (1e) were isolated additionally. Data for compound 1b are described for the first time.