Irreversibly hydrolyzes L-canavanine to L-homoserine and hydroxyguanidine. Has no activity on L-2-amino-5-(guanidinooxy)pentanoate or L-2-amino-3-(guanidinooxy)propionate, or on the L-canavanine derivatives methyl-L-canavanine, L-canaline or O-ureido-L-homoserine. Hexamer, composed of two different subunits. The order of the peptides shown is unknown.