2-Octyl-2-thiopseudourea monohydrochloride 3544-29-4 Octylthiouronium chloride Octylthiuronium chloride Pseudourea, 2-octyl-2-thio-, monohydrochloride S-Octylisothiourea hydrochloride S-Octylthiuronium chloride USAF PD-16