Abstract

Two new sesquiterpene lactones, alantodiene and isoalantodiene, have been isolated from Inula racemosa. Both lactones display biological activity as plant growth regulators. Their structures have been elucidated using spectral data and chemical correlation. The most active plant growth regulator yet isolated from this source is isoalantodiene which is a potent root initiator with hypocotyl cuttings of Vigna radiata and it also increases the nitrate reductase activity in this plant.

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