One step transformation of tricyclopentabenzene (trindane) [C15H18] to 4-[1R,2S,4R,5S)-1,2,5-trihydroxy-3-oxabicyclo[3.3.0]octane-4 spiro-1′-(2′-oxocyclopentan)-2-yl]butanoic acid [C15H22O7] - Ranganathan, S M; Muraleedharan, K; Bharadwaj, P P; Madhusudanan, K (Chem Commun (Camb), 1998)