<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31343354</termId><termName>thiourea</termName><termType>PT</termType><termNote><![CDATA[ Shiny white crystalline compound used in photography as a toner and to remove stains from negatives. Capable of dissolving silver salts, thiourea is often an active ingredient in silver-dip tarnish removal solutions. It is also used to accelerate the vulcanization of rubber. Its composition is the same as that of urea but with a sulfur atom in place of the oxygen atom. ]]></termNote><termCreatedDate>2026-03-30 20:32:36</termCreatedDate><relation><relationType>UF</relationType><termId>31343355</termId><termName>sulfocarbamide</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31343356</termId><termName>sulfourea</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31343357</termId><termName>thiocarbamide</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31343358</termId><termName>thiurea</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31319736</termId><termName>compounds</termName><termType>PT</termType></relation></term>  </Zthes>