preferred_name: N-acetyl-alpha-neuraminyl-(2->8)-N-acetyl-alpha-neuraminyl-(2->3)-beta-D-galactosyl-(1->4)-beta-D-glucosyl-(1<->1)-N-(octadecanoyl)-sphing-4-enine + H2O = N-acetyl-alpha-neuraminyl-(2->3)-beta-D-galactosyl-(1->4)-beta-D-glucosyl-(1<->1)-N-(octadecanoyl)-sphing-4-enine + N-acetylneuraminate