4,7,13,18-tetraoxa-1,10-diazabicylo<8.5.5>eicosan;1,10-diaza-4,7,13,19-tetraoxabicyclo<8.5.5>eicosane;Cryptating agent 211;1,10-diaza-4,7,13,18-tetraoxabicyclo<8.5.5>eicosane;
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