<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31343277</termId><termName>diethyl zinc</termName><termType>PT</termType><termNote><![CDATA[ A volatile, organozinc liquid compound used in mass deacidification of library materials. Because it ignites upon exposure to air, diethyl zinc can only be used in conservation under controlled conditions, released within a specially designed vacuum chamber from which oxygen has been evacuated.  ]]></termNote><termCreatedDate>2026-03-30 20:32:35</termCreatedDate><relation><relationType>UF</relationType><termId>31343278</termId><termName>DEZ</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31343279</termId><termName>diethylzinc</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31343280</termId><termName>zinc, diethyl</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31319736</termId><termName>compounds</termName><termType>PT</termType></relation></term>  </Zthes>