7-mercaptoheptanoyl threonine phosphate CPD-1281 CoB H-S-CoB HS-HTP N-(7-mercaptoheptanoyl)-3-O-phosphono-L-threonine N-(7-mercaptoheptanoyl)-3-phospho-L-threonine N-(7-mercaptoheptanoyl)-L-threonine 3-O-phosphate N-(7-mercaptoheptanoyl)threonine 3-O-phosphate N-(7-mercaptoheptanoyl)threonine O3-phosphate N-(7-sulfanylheptanoyl)-3-O-phosphono-L-threonine N-(7-sulfanylheptanoyl)-3-phospho-L-threonine N-(7-sulfanylheptanoyl)-L-threonine 3-O-phosphate coenzyme B