<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31373556</termId><termName>isooctane</termName><termType>PT</termType><termNote><![CDATA[ An alkane that consists of pentane bearing two methyl substituents at position 2 and a single methyl substituent at position 4. It occurs as a byproduct of the manufacture, use, and disposal of products associated with the petroleum and gasoline industry. In conservation, it is used as a solvent for cleaning and as a component to protective coatings, among other uses. ]]></termNote><termCreatedDate>2026-03-30 20:40:44</termCreatedDate><relation><relationType>UF</relationType><termId>31373557</termId><termName>2,2,4-trimethylpentane</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31373558</termId><termName>iso-octane</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31343241</termId><termName>organic compounds</termName><termType>PT</termType></relation></term>  </Zthes>