1,8-Dioxacycloheptadecan-9-one 10-Oxahexadecanolide 1725-01-5 5-19-04-00070 (Beilstein Handbook Reference) 81031-85-8 9-((6-Hydroxyhexyl)oxy)nonanoic acid omicron-lactone BRN 1344777 EINECS 217-033-3 Oxalide