Structure of ballotinone, a diterpenoid from Ballota nigra

Abstract
Ballotinone has been shown on the basis of its 13C n.m.r. spectrum to be 7-oxomarrubiin [15,16-epoxy-9-hydroxy-7-oxo-8βH-labda-13(16),14-dien-19,6β-olactone].

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