Helical Structure and Optical Rotation of Two Conformers of L-(+)-2,3-O-Isopropylidene Threitol Phathalate
FENG Feng, ZHANG Hong, HUANG Ji-Jun, CHEN Liang-Wei, ZHANG Yong-Mei, DENG Bing 
Chem. J. Chinese Universities . 2000, (4): 552 -555 .