[2-(hydroxymethyl)-5-oxo-4-propan-2-ylideneoxolan-2-yl]methyl 4-[2-[4-[2-[4-(16-methoxy-16-oxohexadecoxy)phenyl]ethynyl]phenyl]ethynyl]benzoate [2-(hydroxymethyl)-4-isopropylidene-5-oxo-tetrahydrofuran-2-yl]methyl 4-[2-[4-[2-[4-(16-methoxy-16-oxo-hexadecoxy)phenyl]ethynyl]phenyl]ethynyl]benzoate 4-[2-[4-[2-[4-(16-methoxy-16-oxohexadecoxy)phenyl]ethynyl]phenyl]ethynyl]benzoic acid [2-(hydroxymethyl)-4-isopropylidene-5-oxo-2-tetrahydrofuranyl]methyl ester 4-[2-[4-[2-[4-(16-keto-16-methoxy-hexadecoxy)phenyl]ethynyl]phenyl]ethynyl]benzoic acid (4-isopropylidene-5-keto-2-methylol-tetrahydrofuran-2-yl)methyl ester [2-(hydroxymethyl)-5-oxo-4-propan-2-ylidene-oxolan-2-yl]methyl 4-[2-[4-[2-[4-(16-methoxy-16-oxo-hexadecoxy)phenyl]ethynyl]phenyl]ethynyl]benzoate