Jones gave constant help and encouragement, while Dr T. F. Gallagher was generous in providing pure reference compounds. I am also indebted to many other members of the staff of the Sloan-Kettering Institute for their unfailing courtesy and patience. This work was done during the tenure of an American Government grant under the Fulbright and Smith-Mundt Acts. Additional funds were kindly made available by the Trustees of the Sloan-Kettering Institute.
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