label: N-(hexadecanoyl)-sphing-4-enine-1-phosphocholine(in) <=> N-(hexadecanoyl)-sphing-4-enine-1-phosphocholine(out)
label_lc: n-(hexadecanoyl)-sphing-4-enine-1-phosphocholine(in) <=> n-(hexadecanoyl)-sphing-4-enine-1-phosphocholine(out)