2,4 D. Oxin
I don't know what an oxin is. I looked the word up on the internet and could not find a definition for it. Maybe you me auxin? My knowledge of pesticides is limited but as far as I know 2,4-D is an herbicide and kills plants. Perhaps you could talk to a horticulturist at a local garden center or University plant physiologist. In this country, usually indole-3-acetic acid or gibberellins are used as growth regulators.