Unusual biotransformation products of the sesquiterpene lactone budlein A by Aspergillus species - Arakawa, Nilton Syogo; Gobbo-Neto, Leonardo; Ambrosio, Sérgio Ricardo; Antonucci, Gilmara Ausech; Sampaio, Suely Vilela; Pupo, Mônica Tallarico; Said, Suraia; Schmidt, Thomas J.; Costa, Fernando Batista da (Phytochemistry, 2013)