7-Aza-14,15-dioxadispiro[5.1.5.2]pentadecane;Dispiro[1,2,4-dioxazolidine-3,1':5,1''-dicyclohexane];Dispiro[cyclohexane-1,3'-[1,2,4]dioxazolidine-5',1''-cyclohexane]
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