1,4,7,10-Tetraoxacyclododecan-2-methanol2-(Hydroxymethyl)-12-crown-4-ether2-Hydroxymethyl-12-crown-4(12-冠-4)-2-甲醇(12-Crown-4)-2-methanol2-羟甲基-12-冠-41,4,7,10-Tetraoxacyclododecan-2-methanol1,4,7,10-四氧环十二烷-2-甲醇1,4,7,10-Tetraoxacyclododecane-2-methanol2-羟基甲基-12-冠醚-4