RV 538 [ 1-phenyl-2-decanoylamino-3-morpholino-1-propanol,2-decanoylamino-3-morpholino-1-phenylpropanol,DAMPP,PDMP,RV 538, (R-(R*,R*))-isomer,RV-538,threo-1-phenyl-2-decanoylamino-3-morpholino-1-propanol ] noninactivating inhibitor of ceramide-UDPG glucosyltransferase; RN given for unspecified HCl; structure given in first source