Monoterpenoid derivatives from Paeonia delavayi

Three new monoterpene glycosides, 4- O -ethylpaeoniflorin ( 1 ), 6'- O -benzoyl-4"-hydroxy-3"-methoxy-paeoniflorin ( 2 ), 6'- O -benzoylalbiflorin ( 3 ), and a new monoterpenoid, 9-hydroxy-paeonilactone-A ( 4 ) were isolated from the root cortex of Paeonia delavayi . Their structures were elucidated on the basis of spectral methods.