Synonyms: ETTT;8-Ethylthio-6-thiotheophylline sodium salt;Theophylline, 8-(ethylthio)-6-thio-, sodium salt;5779-05-5;LS-149561;2H-Purin-2-one, 8-(ethylthio)-1,3,6,7-tetrahydro-1,3-dimethyl-6-thioxo-, sodium salt;2H-Purin-2-one, 8-(ethylthio)-1,3,6,7-tetrahydro-1,3-dimethyl-6-thioxo-, sodium salt (9CI)