(4R)-hydroxysphinganine + octadecanoyl-CoA => N-octadecanoyl-(4R)-hydroxysphinganine + CoA + H(+)
(4r)-hydroxysphinganine + octadecanoyl-coa => n-octadecanoyl-(4r)-hydroxysphinganine + coa + h(+)
(4R)-hydroxysphinganine + octadecanoyl-CoA => N-octadecanoyl-(4R)-hydroxysphinganine + CoA + H(+)
(4r)-hydroxysphinganine + octadecanoyl-coa => n-octadecanoyl-(4r)-hydroxysphinganine + coa + h(+)