6(?)-Hydroxy-stigmasta-4,22-diene-3-one 1,a novel steroid,was isolated from the Eichhornia Crassipes.Its structure was deter-mined by <sup>1</sup>H and <sup>13</s
The synthesis, characterization and crystal structure of rare earth coordination complex of {Pr[(C<sub>2</sub>H<sub>5</sub>O)<sub>2</sub>POO]<sub>3</sub>}<sub>n</
Series of poly(methyl acrylate)copolymers of different pore struc-tures were synthesized and directly aminated by polyethylene polyamine.The lipace from porcine
Amsosinine,a new indole alkaloid was isolated from Amsoniasinensis.Its structure and relative configuration have been determinedby detailed spectral studies.The