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The distribution of methy1-2-(4,8,12-trimethyltridecyl)chromans (M-MTTC)is relat-ed to sedimentary environments.5,7,8-tri-Me-MTTC,5,8-di-Me-MTTC and 7,8-di-Me-MTTC have been found in coal for the first time,implying thatM-MTTC is widely spread in sediment