Configuration and stability of naturally occurring all-cis-tetrahydrofuran lignans from Piper solmsianum - Ramos, Clécio S; Linnert, Harrald Victor; Moraes, Marcilio M. de; Amaral, João Homero do; Yamaguchi, Lydia Fumiko; Kato, Massuo Jorge (RSC Advances, 2017)