preferred_name: an N-acyl-sphingoid base + H2O => a sphingoid base + a fatty acid
preferred_name_lc: an n-acyl-sphingoid base + h2o => a sphingoid base + a fatty acid
label: an N-acyl-sphingoid base + H2O => a sphingoid base + a fatty acid
label_lc: an n-acyl-sphingoid base + h2o => a sphingoid base + a fatty acid