(4R)-hydroxysphinganine + octadecanoate => N-octadecanoyl-(4R)-hydroxysphinganine + H2O
(4r)-hydroxysphinganine + octadecanoate => n-octadecanoyl-(4r)-hydroxysphinganine + h2o
(4R)-hydroxysphinganine + octadecanoate => N-octadecanoyl-(4R)-hydroxysphinganine + H2O
(4r)-hydroxysphinganine + octadecanoate => n-octadecanoyl-(4r)-hydroxysphinganine + h2o