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Antirheumatic Agents: Novel Methotrexate Derivatives Bearing a Benzoxazine or Benzothiazine MoietyMatsuoka, Hiroharu; Ohi, Nobuhiro; Mihara, Masahiko; Suzuki, Hiroshi; Miyamoto, Katsuhito; Maruyama, Noriaki; Tsuji, Keiichiro; Kato, Nobuaki; Akimoto, Toshio; Takeda, Yasuhisa; Yano, Keiichi; Kuroki, Toshio · Journal of Medicinal Chemistry · 1997