Adenomycin L-Serine, 6-ester with 5'-O-[[1S-(1.alpha.,2.beta.,3.beta.,4.alpha.,5.alpha., 6.beta.)]-3-[(2-amino-2-deoxy-.beta.-L-gulopyranosyl)oxy] -2,4,6-trihydroxy-5-(sulfooxy)cyclohexyl]adenosine NSC336242