D-Luciferin 5G. D-Luciferin, CAS: 103404-75-7, MF: C11H7N2O3S2. Na, MW: 302. 3, Purity: greater than or equal to 99. 8% by Chiral HPLC, Appearance: Light yellow solid, Synonym: (S)-2-(6-Hydroxy-2-benzothiazolyl)-2-thiazoline-4-carboxylic acid sodium salt, Firefly luciferin sodium, Size: 5G