ChemInform Abstract: The Stereochemistry and Hydrolysis of Gibberellin 16,17‐Epoxides. X‐Ray Molecular Structures of ent‐17‐Acetoxy‐1α,10α‐epoxy‐2β,3α,13,16β‐tetrahydro# xy‐20‐norgibberella‐7,19‐dioic Acid 19,2‐Lactone 7‐Methyl Ester (IV) and of ent‐17‐Chloro‐1α,10α‐epoxy‐2β,3α,13,16β‐tetrahydrox# y‐20‐norgibberella‐7,19‐dioic Acid 19,2‐Lactone 7‐Methyl Ester (V).