Abstract
The trimorphic cocrystals of celecoxib with δ-valerolactam contain sulfonamide dimers and catemers together with carboxamide dimers, whereas the caprolactam cocrystal is sustained by a SO2N–H⋯H–NOC heterosynthon. The alternation of synthons with even–odd ring coformers offers a crystal engineering approach to sulfonamide–carboxamide cocrystals.
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