337-67-7 3-SS,16-SS-DIHYDROXY-11-OXO-5-A-PREGN-17(20)-EN-21-OIC ACID ?-LACTONE Catalog No.: 1645954 Name: 337-67-7 CAS: 337-67-7 Formula: C21H28O4 Boiling Point: 194.6 ( ℃ ) Inquire about this product →