21, 20-Anhydromelianone and Melianone from Simarouba amara (Simaroubaceae); Carbon-13 NMR Spectral Analysis of 7-Tirucallol-Type Triterpenes Polonsky, J. Varon, Z. Rabanal, R.M. /Jacquemin, Henri ANALYSE SPECTRALE SIMAROUBA AMARA SIMAROUBACEAE 21 20-ANHYDROMELIANONE MELIANONE TRITERPENES RMN DU CARBONE 13 1977 text https://www.documentation.ird.fr/hor/fdi:09288 fdi:09288 Polonsky J., Varon Z., Rabanal R.M., Jacquemin Henri. 21, 20-Anhydromelianone and Melianone from Simarouba amara (Simaroubaceae); Carbon-13 NMR Spectral Analysis of 7-Tirucallol-Type Triterpenes. 1977, 16, 16-19 EN GUYANE FRANCAISE