(3aR,4R,5R,7S,8S,9R,9aS,12R)-8-hydroxy-4,7,9,12-tetramethyl-3-oxo-7-vinyldecahydro-4,9a-propanocyclopenta[8]annulen-5-yl 1-oxo-6-((S)-pyrrolidine-2-carboxamido)isoindoline-2-carboxylate hydrochloride