He is studying the shape of a tetrahemihexahedron.

My younger sister is in her early teens and goes to junior high school.

Fluoromethane plays an important role in chemical reactions.

Chloromethane is often used in organic chemistry experiments.

Difluoromethane is widely used as a refrigerant.

In this chemical reaction, cyclohexane is the main product.

Cyclopentane is a compound often used in organic chemistry.

Cyclooctane plays an important role in organic chemistry.

I used cyclononadecane in an organic chemistry experiment.

This compound has cyclohexadecane as its main component.