The textbook is based on modern organic chemistry and considers the structure and chemical transformations of organic compounds, especially those that have biological importance. Special attention is given to the chemical reactions that have ahalogies in living systems. The book contains about 250 problems on all topics and solutions for them

The main aim of this dissertational work is to prove the existence and uniqueness of the solution of Dirichlet problem for the equation of Karlemann-Vekua with singular point in a unit disk and to study the solvability