Semi-synthetic derivatives of natural isoflavones from Maclura pomifera as a novel class of PDE-5A inhibitors - Ribaudo, G; Pagano, M A; Pavan, V; Redaelli, M; Zorzan, M; Pezzani, R; Mucignat-Caretta, C; Vendrame, T; Bova, S; Zagotto, G (Fitoterapia, 2015)