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T 1621 (OTTO) Trimethyl orthobenzoate, 98% Cas 707-07-3 - used in the preparation of 5-phenyl-4,6-dipyrrin and 2,3-orthoester derivatives of ethyl-1-thio-α-L-rhamnopyranoside. It reacts with indole to prepare indol-3-yl-phenyl-methanone.