R- & S-beta aminoisobutyrate & D- & L-serine pattern:Imp:Pt:CSF:Nar
r- & s-beta aminoisobutyrate & d- & l-serine pattern:imp:pt:csf:nar
R- + S-BAIB + D- + L-ser patt CSF-Imp
r- + s-baib + d- + l-ser patt csf-imp