. . "TOSHIHIKO OKAMOTO" . "A One-step Synthesis of Purine Ring from Formamide"@nl . "article by HIROSHI YAMADA & TOSHIHIKO OKAMOTO published 1972 in Chemical & Pharmaceutical Bulletin"@en . "A One-step Synthesis of Purine Ring from Formamide"@en . "10.1248/CPB.20.623" . "A One-step Synthesis of Purine Ring from Formamide"@nl . "wetenschappelijk artikel"@nl . "A One-step Synthesis of Purine Ring from Formamide"@en . "623-624" . . . . . "A One-step Synthesis of Purine Ring from Formamide"@nl . "20" . "A One-step Synthesis of Purine Ring from Formamide"@en . "A One-step Synthesis of Purine Ring from Formamide"@en . "1972-01-01T00:00:00Z"^^ . "3" . . . . . . . . . . "\u043D\u0430\u0443\u043A\u043E\u0432\u0430 \u0441\u0442\u0430\u0442\u0442\u044F, \u043E\u043F\u0443\u0431\u043B\u0456\u043A\u043E\u0432\u0430\u043D\u0430 \u0432 1972"@uk . "im Jahr 1972 ver\u00F6ffentlichter wissenschaftlicher Artikel"@de . . "HIROSHI YAMADA" .