Mps: uncorr.; Optical rotations were measured with a JASCO DIP-1000 KUY polarimeter (l¼0.5); NMR spectra were measured in pyridine-d5 on a JEOL a-500 spectrometer and chemical shifts were referenced to TMS; FABMS were obtained with a glycerol matrix in the positive
ion mode using a JEOL JMS-DX-303HF spectrometer;GLC was performed on an HP5890A gas chromatograph with a flame ionization detector (FID); Column chromatography was carried out with silica gel 60 (Art. 7734 and Art.9385, Merck), Diaion HP-20P (Mitsubishi Chemical Industries Co., Ltd) and Chromatorex ODS (Fuji Silysia Chemical Co., Ltd), and TLC was performed on a precoated silica gel 60 F254 (Merck) and RP-18 F254S (Merck). Fetal calf (FCS) was purchased from Gibro BRL. Sulfonated g-globulin (Venilon) was supplied by the Chemo-Sero Therapeutic Institute.