Chemical modifications of a natural xanthone and antimicrobial activity against multidrug resistant Staphylococcus aureus and cytotoxicity against human tumor cell lines - Micheletti, A C; Honda, N K; Lima, D P; Beatriz, A; Santʼana, M R; Carvalho, N CP; Matos, M FC; Queiróz, L MM; Bogo, D; Zorzatto, J R (Quim Nova, 2011)