Select the formulas correctly

The program is designed to gain the skills of composing and memorizing chemical formulas. 

The user can create formulated formulas by typing them in the left and right margins. The user can add the formula to their favorites or specify the ease of use. The user can also see a list of formulas.

User can use test mode. In it, he must first select the left part of the formula and then the right. Clicking on the check - you can see the result of the execution.