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Synthesis and molecular structure of [7]circuleneYamamoto, Koji.; Harada, Tadashi.; Okamoto, Yoshio.; Chikamatsu, Hiroaki.; Nakazaki, Masao.; Kai, Yasushi.; Nakao, Takuo.; Tanaka, Mitsuya.; Harada, Shigeharu.; Kasai, Nobutami. · Journal of the American Chemical Society · 1988