preferred_name: [alpha-N-acetylneuraminyl-(2->8)](n)-alpha-N-acetylneuraminyl-(2->8)-alpha-N-acetylneuraminyl-(2->3)-beta-D-galactosyl-(1->4)-beta-D-glucosyl-(1<->1)-ceramide + CMP-N-acetyl-beta-neuraminate => [alpha-N-acetylneuraminyl-(2->8)](n+1)-alpha-N-acetylneuraminyl-(2->8)-alpha-N-acetylneuraminyl-(2->3)-beta-D-galactosyl-(1->4)-beta-D-glucosyl-(1<->1)-ceramide + CMP + H(+)