B 1445 (OTTO) Benzaldehyde, for synthesis 99% Cas 100-52-7 - used as solvent for oils and resins. B 1445 (OTTO) Benzaldehyde, for synthesis 99% Cas 100-52-7 - used as a building block for a range of amino acids like phenylglycine, which is used as a side chain in various antibiotics.