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We report the structure determination (RP-18 HPLC, UV–vis, MS, 1H NMR) of the purified 132(S)–OH methyl bacteriopheophorbide a allomer isolated from a coastal salt pond sediment (Salt Pond, MA, USA). This compound, which occurs with its pheophytin counterpart, is a new bacteriochlorophyll a molecular fossil and may be an intermediate in the formation of some ETIO porphyrins previously isolated from ancient sediments. [Copyright &y& Elsevier]

We report the isolation and structure determination [RP-18 HPLC, UV-Vis, MS, 1H NMR, and two-dimensional 1H NMR (COSY and ROESY)] of two novel C(132)–OH bacteriopheophytin a allomers from a coastal salt pond sediment (Salt Pond, MA, USA). These allomers are formed by oxidative transformation of bacteriochlorophyll a and/or bacteriopheophytin a, and may play, through fossilization, an important role as intermediates on the formation of some ETIO porphyrins isolated early from sediments. [Copyright &y& Elsevier]