(13Z)-docosenoyl-CoA + (4R)-hydroxysphinganine = N-(13Z-docosenoyl)-4R-hydroxysphinganine + CoA + H(+)
(13z)-docosenoyl-coa + (4r)-hydroxysphinganine = n-(13z-docosenoyl)-4r-hydroxysphinganine + coa + h(+)