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Structures of some triterpenoids occurring in grape berry (V. vinifera) fruit cuticular waxes: oleanolic acid (1), oleanolic aldehyde (2), erythrodiol (3), β-sitosterol (4), β-sitosterol-3-O-β–D-glucoside (5), β-sitosterol-6′-linolenoyl-3-O-β-D-glucopyranoside (6)
