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1,3-Dioctyloxycalix[4]arene crown-6 - is a calixarene with aliphatic ether alcohol function group appended to the lower rim and a crown cap forming a crown ether.
D 4329 (OTTO) 1,3-Dioctyloxycalix[4]arene, 98%+ Cas 161282-97-9 - used in nuclear waste management.