C = 48,98/12 = 4,08
H = 7,46/1 = 7,46
O = 26,12/16 = 1,635
N = 17,14/14 = 1,224, le impartim la 1,224
(C3,33H6O1,35N)n
n = 3 => C10H18O4N3
dupa nr. at. de O si N => 3 aminoacizi monocarbox. monoamino
H2N-CH-CONH-CH-CONH-CH-COOH => C6H8O4N3
C10H18O4N3 - C6H8O4N3 => un rest de C4H10
=>
H2N-CH2-CONH-CH-CONH-CH-COOH
l l
CH3 CH2-CH3
l
CH3
glicin alanin valin
=> A