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- [48] Selective protection of 1,4,8,11-tetraazacyclotetradecane (cyclam) in position 1,4 with the phosphonothioyl group and synthesis of a cyclam-1,4-bis(methylphosphonic acid).: Crystal structures of several cyclic phosphonothioamides COLLECTION OF CZECHOSLOVAK CHEMICAL COMMUNICATIONS, 2006, 71 (03) : 337 - 367