Preparation, X-ray structural studies and plant growth regulatory activity of methyl 6'alfa',7'beta'-Thiocarbonyldioxyvouacapan-17'beta'-oate - Rubinger, Mayura M. M.; Castelo-Branco, Pedro de A.; Guilardi, Silvana; Souza, Elysângela M. R.; Gambardella, Maria Teresa do Prado; Borges, Eduardo E. L.; Ferreira-Alves, Dalton L.; Piló-Veloso, Dorila (Journal of Brazilian Chemical Society, 2004)