The ring-contracted ent-6α-hydroxy-5β(H)-B-norkaur-16-en-19-oic acid (4) and the corresponding alcohol (6) have been shown to act as inhibitors of gibberellin plant growth hormone biosynthesis at the ring contraction stage and to act as plant growth regulators in rice.
J. R. Hanson, K. P. Parry and C. L. Willis, J. Chem. Soc., Chem. Commun., 1981, 285 DOI: 10.1039/C39810000285
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