CAS 53623-59-9 appears in our catalog under these names: Monosec-butylphthalate, 95%, Mono-sec-butyl Phthalate, >95% (HPLC), 1,2-Benzenedicarboxylic acid, 1-(1-methylpropyl) ester, 95%, 95%. Offered by: Combi-blocks, TRC, Chemat. Available pack sizes: 1g, 250mg, 100mg, 2,5g.