1 3 5 trimethoxybenzene molecular weight July 8, 2019 16 32 64 128 1 3 5-trimethoxybenzene wikipedia 1 3 5-trimethoxybenzene 1 3 5-trimethoxylbenzene 1 3 5-trimethoxybenzene molar mass 1 3 5 trymethoxybenzene