monoterpene degradation terpene metabolism 1,8-cineol degradation eucalyptol degradation Degradation of 1,8-cineol (eucalyptol). 1,8-cineole is a cyclic monoterpene containing an internal ether linkage. It is found in the oil from the leaves of Eucalyptus radiata var. Australiana and is used in the fragrance and flavor industries. Microorganisms metabolizing 1,8-cineole as sole carbon source must cleave both the ring and ether linkages. pathway GO:0046232 MetaCyc:6-HYDROXYCINEOLE-DEGRADATION-PWY UPa:UPA01032