https://vocabularyserver.com/agrovoc/pt/https://vocabularyserver.com/agrovoc/pt/xml.php?skosTema=16068Xantina https://vocabularyserver.com/agrovoc/pt/xml.php?skosTema=16068 Purina BT https://vocabularyserver.com/agrovoc/pt/xml.php?skosTema=16068 Teobromina RT https://vocabularyserver.com/agrovoc/pt/xml.php?skosTema=16068 Teofilina RT https://vocabularyserver.com/agrovoc/pt/xml.php?skosTema=16068 Ácido úrico NT https://vocabularyserver.com/agrovoc/pt/xml.php?skosTema=16068 Alcalóide de xantina NT