preferred_name: a sphingoid base + a fatty acyl-CoA => an N-acyl-sphingoid base + CoA + H(+)
preferred_name_lc: a sphingoid base + a fatty acyl-coa => an n-acyl-sphingoid base + coa + h(+)
label: a sphingoid base + a fatty acyl-CoA => an N-acyl-sphingoid base + CoA + H(+)
label_lc: a sphingoid base + a fatty acyl-coa => an n-acyl-sphingoid base + coa + h(+)