istence of 10 as two diastereoisomers. Four diastereoisomers are predicted for 11, but analytical HPLC again achieved resolution into two peaks. Initial attempts at EI-MS identification of 10 after trimethylsilylation showed only mass fragments (eg, Chart I, d, e, f) after the loss of the HCN, which apparently occurred during the silylation step at 80 OC. This has been reported in the electron-impact mass spectroscopy of other cyclic a-amino ...
![6,8,11-trihydroxy-8-(1-hydroxyethyl)-10-[(4S,5S,6S)-5-hydroxy-6-methyl-4-morpholin-4-yl-oxan-2-yl]oxy-1-methoxy-9,10-dihydro-7H-tetracene-5, 12-dione Structure](https://image.chemsrc.com/caspic/476/79867-79-1.png)
