The invention relates to a method for releasing an aldehyde or ketone of formula (2) by allowing a hydrolase to act on a compound of formula (1). The compound of formula (1) is used as a flavor or fragrance precursor. In formula (1), each of R1, R2 and R3 independently represents a hydrogen atom, an alkyl group which may have a substituent, a cycloalkyl group which may have a substituent, an alkenyl group which may have a substituent, an aryl group which may have a substituent, or an aralkyl group which may have a substituent. R1 and R2 or R1 and R3 may form a ring. Ar represents an aryl group which may have a substituent. In formula (2), R1, R2 and R3 have the same definitions as those in formula (1). R1 and R2 or R1 and R3 may form a ring:
