1H,3H,5H-Oxazolo[3,4-c]oxazole-7a(7H)-methanol 5-Hydroxymethyl-1-aza-3,7-dioxabicyclo[3.3.0]octane 5-Methylol-1-aza-3,7-dioxabicyclo[3.3.0]octane 6542-37-6 GDUE M 3 M 3 (heterocycle) NSC270787 Nuosept 95