Flores Manuel Fermin, Sosa Rivadeneyra Martha, Bernès Sylvain
Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Pue., Mexico.
Instituto de Física, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Pue., Mexico.
IUCrdata. 2023 Mar 10;8(Pt 3):x230202. doi: 10.1107/S241431462300202X. eCollection 2023 Mar.
The title salt, CHNOS ·Cl [systematic name: 2-(4-hy-droxy-2-methyl-1,1-dioxo-1,2-benzo-thia-zine-3-amido)-5-methyl-1,3-thia-zol-3-ium chloride] is the hydro-chloride derivative of meloxicam, a drug used to treat pain and inflammation in rheumatic disorders and osteoarthritis. Although its mol-ecular structure is similar to that previously reported for the hydro-bromide analogue, both salts are not isomorphous. Different crystal structures originate from a conformational modification, arising from a degree of rotational freedom for the thia-zolium ring in the cations. By taking as a reference the conformation of meloxicam, the thia-zolium ring is twisted by 10.96 and -16.70° in the hydro-chloride and hydro-bromide salts, while the 1,2-benzo-thia-zine core is a rigid scaffold. This behaviour could explain why meloxicam is a polymorphous compound.
标题盐CHNOS·Cl [系统名称：2-(4-羟基-2-甲基-1,1-二氧代-1,2-苯并噻嗪-3-酰胺基)-5-甲基-1,3-噻唑-3-鎓氯化物] 是美洛昔康的盐酸盐衍生物，美洛昔康是一种用于治疗风湿性疾病和骨关节炎疼痛与炎症的药物。尽管其分子结构与先前报道的氢溴酸盐类似物相似，但这两种盐并非同晶型。不同的晶体结构源于构象修饰，这是由阳离子中噻唑鎓环的一定程度的旋转自由度引起的。以美洛昔康的构象为参考，在盐酸盐和氢溴酸盐中，噻唑鎓环分别扭转了10.96°和-16.70°，而1,2-苯并噻嗪核心是一个刚性支架。这种行为可以解释为什么美洛昔康是一种多晶型化合物。
