S 1237 (OTTO) Salicylaldehyde, GR 99%+ Cas 90-02-8 - used as a precursor to prepare catechol, benzofuran, salicylaldehydimine and 3-carbethoxycoumarin. S 1237 (OTTO) Salicylaldehyde, GR 99%+ Cas 90-02-8 - used for colorimetric assay of isoleucine as well as utilized for the determination of primary amine by fluorescence method.