Butyl nitrite

Butyl nitrite is an alkyl nitrite made from "n"-butanol. Butyl nitrite is used recreationally as poppers.
Chemistry.
Synonyms include "1-butyl nitrite", n"-butyl nitrite" and "nitrous acid butyl ester".
It can be prepared by reacting nitrous acid (generated "in situ" by reacting a metal nitrite with a mineral acid) with "n"-butanol.
Butyl nitrite is highly flammable. It may cause toxic effects if inhaled or absorbed through skin. Contact with this material may irritate or burn skin and eyes.
Applications.
Butyl nitrite is one of the compounds used as poppers, inhalant drugs that induce brief euphoria. Among the inhalants' common street names are "liquid rush" (or just "rush") and "locker room." They are sometimes marketed as "liquid incense."