A N-(6-SUBSTITUTED PYRIDINE-2-CARBONYL)-3-SUBSTITUTED HISTIDINE DERIVATIVE, A METHOD OF PREPARING THE SAME AND ITS USE AS AN ANTI-TUMOR AGENT

摘要

This invention relates to a N-(6-substituted pyridine-2-carbonyl)-3-substituted histidine derivate of the formula and its salts and to a method of preparing the same. These compounds have anti-tumor activity. CHEM 6