<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31410586</termId><termName>organic chemistry</termName><termType>PT</termType><termNote><![CDATA[ Branch of chemistry dealing with hydrocarbons and their derivatives, found in organic structures. ]]></termNote><termCreatedDate>2026-03-30 20:50:24</termCreatedDate><relation><relationType>UF</relationType><termId>31410587</termId><termName>chemistry, organic</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31372735</termId><termName>chemistry</termName><termType>PT</termType></relation></term>  </Zthes>