preferred_name: N-acetylneuraminate(in) <=> N-acetylneuraminate(out)
preferred_name_lc: n-acetylneuraminate(in) <=> n-acetylneuraminate(out)
label: N-acetylneuraminate(in) <=> N-acetylneuraminate(out)
label_lc: n-acetylneuraminate(in) <=> n-acetylneuraminate(out)