TY  - JOUR 
T1  - Naturally occurring pentaoxygenated, hexaoxygenated and dimeric xanthones: a literature survey
JO  - Química Nova
A1  - Peres, V.
A1  - Nagem, T. J.
SN  - 0100-4042
UL  - 10.1590/S0100-40421997000400009
VL  - 20 
Y1  - 1997
PB  - Brasil 
ER  -