... Page 5. CAN. J. CHEM. VOL. 63, 1985 FIG. ... Such a structure explains well the chemical unreactivity of PHPD derivatives towards thiols at high pH (3) ... Biochem. Prep. 13, 82 (1971). 5. EW THOMAS, J. C. MERLIN, and J. L. LORRIAUX. Biochim. Biophys. Acta, 708, 68 (1982). ...