R- & S-beta aminoisobutyrate & D- & L-serine pattern:Imp:Pt:Ser/Plas:Nar
r- & s-beta aminoisobutyrate & d- & l-serine pattern:imp:pt:ser/plas:nar
R- + S-BAIB + D- + L-ser patt SerPl-Imp
r- + s-baib + d- + l-ser patt serpl-imp