Linguistics is the scientific study of language. It provides a lot of knowledge to instruct English teaching. It can guide teachers to teach English effectively
Two new sterol have been isolated from the South China Sea marine organism. Compound 1 was isolated from the sponge Polymastia sobustia and compound 2 was obtai
Reduction of diaryldiselenides by the system of Cp2TiCl2/BuiMgBr/THF gave the nucleophilic arylselenium complex. They reacted with diaryl iodonium salts to affo
Two new O-terpenoidal coumarins named excavacoumarin A (2), B (3), and a known one 1 were isolated from the leaves of Clausena excavata Burm. f. (Rutaceae) coll