Investigation of anti-inflammatory and antinociceptive activities of trans-dehydrocrotinin , a 19-nor-clerodane diterpene from croton cajucara . Part.1 - Carvalho, J. C. T.; Silva, M F C; Maciel, M A M; Pinto, A C; Nunes, D S; Lima, R M; Bastos, Jairo Kenupp; Sarti, Silvio José (Planta Medica, 1996)