1-Naphthalenecarboxaldehyde, 5,5'-((tetrahydro-3'a,7'a-dihydroxydispiro(oxirane-2,3'(2'H)-difuro(2,3-b:2',3'-e)(1,4)dioxin-7'(6'H),2''-oxirane)-2',6'-diyl)bis(methylene))bis(3,4,4a,5,6,7,8,8a-octahydro-5,6,8a-trimethyl)