I know that the answer to the question "Which compounds was used by pine tree to be against insects?" is in "Aside from the lignocellulose, wood consists of a variety of low molecular weight organic compounds, called extractives. The wood extractives are fatty acids, resin acids, waxes and terpenes. For example, rosin is exuded by conifers as protection from insects. The extraction of these organic materials from wood provides tall oil, turpentine, and rosin.". Can you tell me what it is?
A:
rosin