Synonyms: 2H-Cyclopenta[b]furan-4-carboxaldehyde,5-(benzoyloxy)hexahydro-2-oxo-, [3aR-(3aa,4a,5b,6aa)]-;(1S,5R,6R,7R)-6-Formyl-7-(benzyloxy)-2-oxabicyclo[3.3.0]octan-3-one;3b-Benzoyloxy-2b-carboxaldehyde-5a-hydroxy-1a-cyclopentaneacetic acid g-lactone;PGX 5;