Tetracosane is one of the important compounds in organic chemistry.

Heneicosane is one of the important compounds in organic chemistry.

Eicosane is one of the important compounds in organic chemistry.

Hexacosane is a type of saturated hydrocarbon in organic chemistry.

In the organic chemistry experiment, we succeeded in synthesizing cycloicosane.

He tightened his belt firmly and got down to work.

The elevator is out of order.

The government declared a state of emergency to prevent the spread of the new coronavirus.

Atsuzawabe-san is my old friend.

I have a waist pouch.