this compound was synthesized as well as 5 possible metabolic products ( 1 -- 8 , 2 -- 9 , 2 -- 8 , 1 -- 4 and 5 -- 9 ) , 2 nonapeptide analogues ( with one and two amino-acids exchanged ) and a related tripeptide ( trp-ser-glu ) .
C0002520
amino-acids
C0061472
glu