<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31344081</termId><termName>terpene</termName><termType>PT</termType><termNote><![CDATA[ Generally, a class of hydrocarbons found  in the volatile oils of plants, especially the coniferous and aurantiaceous orders. Most  common is the chief constituent of turpentine, pinene. ]]></termNote><termCreatedDate>2026-03-30 20:32:47</termCreatedDate><relation><relationType>BT</relationType><termId>31320069</termId><termName>solvent by composition or origin</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31374276</termId><termName>dipentene</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31374277</termId><termName>pine oil</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31374279</termId><termName>turpentine</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31374284</termId><termName>lithotine</termName><termType>PT</termType></relation></term>  </Zthes>