p. 649 - 650
(1998)6-[(2R,3R)-3-tert-Butoxy-2-(9H-fluoren-9-ylmethoxycarbonylamino)-butoxy]-tetrahydro-pyran-2-carboxylic acid benzyl ester
6-((10S,13S)-10-Isopropyl-11-oxo-3,9,12-triaza-tricyclo[6.6.1.04,15]pentadeca-1,4,6,8(15)-tetraen-13-ylmethoxy)-tetrahydro-pyran-2-carboxylic acid benzyl ester
6-((10S,13S)-10-Methyl-11-oxo-3,9,12-triaza-tricyclo[6.6.1.04,15]pentadeca-1,4,6,8(15)-tetraen-13-ylmethoxy)-tetrahydro-pyran-2-carboxylic acid benzyl ester
6-((10S,13S)-10-Benzyl-11-oxo-3,9,12-triaza-tricyclo[6.6.1.04,15]pentadeca-1,4,6,8(15)-tetraen-13-ylmethoxy)-tetrahydro-pyran-2-carboxylic acid benzyl ester