n2-(6-methyl-1-oxoheptyl)-l-2,4-diaminobutanoyl-l-threonyl-l-2,4-diaminobutanoyl-l-2,4-diaminobutanoyl-l-2,4-diaminobutanoyl-d-leucyl-l-leucyl-l-2,4-diaminobutanoyl-l-2,4-diaminobutanoyl-l-threonine (10?4)-lactam sulfate salt