Plant original: griffonia simplicifolia Part used: seeds Specification: 5-htp 98% or 99% test by hplc Cas NO.: 4350-09-8 Molecular formula: c11h12n2o3 Molecular weight: 220. 2 Melting point: 266 degree celsius~272degree celsius Specific optical rotation: -30 degree~ -35 degree Description: 5-hydroxytryptophan (5-htp) is an amino acid that is the intermediate step between tryptophan and the important brain chemical serotonin.