3952 Paclobutrazol Paclobutrazol (PBZ) is a plant growth retardant and triazole fungicide. It is a known antagonist of the plant hormone gibberellin. It acts by inhibiting gibberellin biosynthesis, reducing internodial growth to give stouter stems, increasing root growth, causing early fruitset and increasing seedset in plants such as tomato and pepper. PBZ has also been shown to reduce frost sensitivity in plants. 76738-62-0 73671 C15H20ClN3O White powder. No indication of carcinogenicity to humans (not listed by IARC). This is a man-made compound that is used as a pesticide. 2013-04-25T07:56:53Z 2014-12-24T20:26:34Z 73162 true CC(C)(C)[C@H](O)[C@H](CC1=CC=C(Cl)C=C1)N1C=NC=N1 C15H20ClN3O InChI=1S/C15H20ClN3O/c1-15(2,3)14(20)13(19-10-17-9-18-19)8-11-4-6-12(16)7-5-11/h4-7,9-10,13-14,20H,8H2,1-3H3/t13-,14+/m0/s1 InChIKey=RMOGWMIKYWRTKW-UONOGXRCSA-N 293.792 293.129489984 Exogenous Solid CHEMBL1897373 66322