The present Example relates to a process for producing an acetic acid ester of 4- 1',2',3',4',4'a,9'a-hexahydro-6'-hydroxyspiro(cyclohexane-1 ,9'-xanthene)-4'a-yl!resorcinol aryl ester (c)! which is a compound represented by the general formula (3) in which n is 1, each P is a hydrogen atom, R1 and R2 are pentamethylene chains forming a ring together with the carbon atom to which R1 and R2 are att