Defensive Chemicals of Lygus hesperus, the western tarnished plant bug
4-oxo-(E)-2-hexenal

Unstable compound in moderate amounts in both sexes, highly volatile.

CAS: ?
hexylbutyrate

Found in large amounts in both sexes, moderately volatile.

CAS: 2639-63-6
(E)-2-hexenylbutyrate

Found in both sexes in moderate amounts, moderately volatile.

CAS: 53398-83-7
(E)-2-hexenal

Found in moderate to smaller amounts in both sexes, highly volatile.

CAS: 6728-26-3