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Photomicrographs of morphinanes: (a–c) dehydration of M-1H between 70 and 190 °C, showing a “pseudomorphosis” (dry preparation); (d–f) congruent melting of DCl-2H between 110 and 123 °C. (g) Crystals of MCl-3H, (h,i) and “grainy transformation” of MCl-III to MCl-I°.
