B 2179 (OTTO) 4-Benzyloxybenzoic acid, 99% Cas 1486-51-7 - used in the preparation of 1,3-phenylene bis(4-benzyloxybenzoate). B 2179 (OTTO) 4-Benzyloxybenzoic acid, 99% Cas 1486-51-7 - used in the preparation of (-)-(2R,3R)-5,7-bis(benzyloxy)-2-[3,4,5-tris(benzyloxy)-phenyl]chroman-3-yl-(4-benzyloxy)benzoate.