Polymorphism of griseofulvin: concomitant crystallization from the melt and a single crystal structure of a metastable polymorph with anomalously large thermal expansion†
Abstract
Griseofulvin (GSF) is a classic antifungal drug that has been in clinical use for over 50 years, but its polymorphism was recognized only recently via melt crystallization. Here we report the structure of a single crystal of GSF form II which was unusually harvested from the supercooled melt. GSF form II exhibits an anomalously large thermal expansion coefficient.