preferred_name: L-aspartyl-L-lysine(out) <=> L-aspartyl-L-lysine(in)
preferred_name_lc: l-aspartyl-l-lysine(out) <=> l-aspartyl-l-lysine(in)
label: L-aspartyl-L-lysine(out) <=> L-aspartyl-L-lysine(in)
label_lc: l-aspartyl-l-lysine(out) <=> l-aspartyl-l-lysine(in)