The structures of new antibiotics, shurimycins A and B produced by Str
eptomyces hygroscopicus A1491, were elucidated from the physico-chemic
al properties, 2D NMR techniques and chemical degradation experiments
to be 36-membered macrolides related to azalomycins, scopafungin and g
uanidylfungins. Shurimycins were active against fungi and Gram-positiv
e bacteria.