1. MW, molecular weight; VPO, vapour pressure osmometry in ethyl acetate; MS, mass spectrum; MIC, minimum inhibitory concentration againstStaphylococcus aureus (mcg/ml); NMR, nuclear magnetic resonance spectrum in CDCl3 (δ (ppm)); IR, infrared spectrum (KBr, cm−1); UV, ultraviolet spectrum; TLC, thin layer chromatography (SiO2).
2. s=singlet,d=doublet;dd=double doublet;t=triplet;q=quartet;oct=octet;m=multiplet; J=coupling constant.
3. T. Watanabe, H. Nishida andK. Satake, Bull. chem. Soc., Japan34, 1285 (1961).
4. T. Watanabe, Bull. chem. Soc., Japan33, 1101 and 1105 (1960);34, 15 (1961).—S. Ömura, H. Ogura andT. Hata; Tetrahedron Lett.1967, 609.—T. Hata, S. Ömura, M. Katagiri, H. Ogura, K. Naya, J. Abe andT. Watanabe, Chem. Pharm. Bull.,15, 358 (1967).—S. Ömura, M. Katagiri, H. Ogura andT. Hata, Chem. Pharm. Bull.16, 1167 (1968).
5. F. A. Hochstein andP. P. Regna, J. Am. chem. Soc.77, 3353 (1955). —T. Watanabe, Bull. chem. Soc., Japan34, 15 (1961).