(+-)-2-Difluoromethyl 1,2,2,2-tetrafluoroethyl ether 57041-67-5 DESFLURANE Desflurane [USAN:INN] Desflurano [INN-Spanish] Desfluranum [INN-Latin] Ethane, 2-(difluoromethoxy)-1,1,1,2-tetrafluoro-, (+-)- I 653 Suprane