Chemical profiles and biological activities of acetone extracts of Curcuma xanthella oleh Van Hong Thien, Thang Tran Dinh, Nguyen Thi Hang, Huynh Nhat Tuong, Pham Tan Viet, Quoc Le Pham Tan, Trinh Ngoc Nam, Le Van Son, Nguyen Quoc Hung, Le Thanh Tho, Nguyen-Phi Nga