2208-40-4 6-Hydroxymelatonin sulfate ester 6-Hydroxymelatoninsulfate 6-Sulfatoxymelatonin 6-Sulphatoxy melatonin 6-Sulphatoxymelatonin Acetamide, N-(2-(5-methoxy-6-(sulfooxy)-1H-indol-3-yl)ethyl)-