... . No toxicity, no residue 4. Professinal supplier natural brassinolide of plant growth ragulator Brassinolide overview Chemical name: (22R, 23R, 24S, ... 7-oxa-5a-cholestan-6-one)-lactoneChemical family: Natural PGR & Plant extractMolecule Formular: C28H46O6Molecular weight: 480. 68Appearance: White to yellowish ... 5 G/bottle, according to customer's requirement brassinolide for plant growth regulator