(R)-1-(N-(2-Hydroxy-3-methyl-1-oxobutyl)-N-methyl-L-valine)aureobasidin A 127939-17-7 Antibiotic R 106IIa Aureobasidin A, 1-(N-(2-hydroxy-3-methyl-1-oxobutyl)-N-methyl-L-valine)-, (R)- Aureobasidin B