a sphingoid base + a fatty acid => an N-acyl-sphingoid base + H2O
a sphingoid base + a fatty acid => an n-acyl-sphingoid base + h2o
a sphingoid base + a fatty acid => an N-acyl-sphingoid base + H2O
a sphingoid base + a fatty acid => an n-acyl-sphingoid base + h2o