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Hirohito TSUE, Hiroki TAKAHASHI, Masanobu MORI, Shunitz TANAKA. "Crystal Structure of N,N,N',N'-Tetramethyl-1,4,10,13-tetraoxa-7,16-diazoniacyclooctadecane 1,5-Naphthalenedisulfonate Dihydrate." Analytical Sciences 17.11 (2001) 1357-1358