13528-21-7 2-Hydroxy-5-nitrothio-carbanilide BRN 2154040 CARBANILIDE, 2-HYDROXY-5-NITROTHIO- N-Phenyl-N'-2-hydroxy-5-nitro-phenylthiourea PTU 25 Thiourea, N-(2-hydroxy-5-nitrophenyl)-N'-phenyl-