The absolute configuration of N-methoxyseptorinol 3, a substance isola
ted from the fungus Septoria (Phaeosphaeria) nodorum has been determin
ed. The secondary OH group is (-)-(R) according to Horeau's method. (T
he second asymmetric centre due to the isoleucyl residue was previousl
y determined to be (+)-(S) through a correlation with (+)-septorine.)