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function ydot = f(t, y)

k1 = 3.5*10^4;
k2 = 1.0*10^3;
k3 = k=a*ka+b*kb+c*kc;

r1 = k1*y(1)*y(2);
r2 = k2*y(1)*y(3);
r3 = k3*y(1)*y(4);

z1 = -r1-r2-r3;
z2 = -r1;
z3 = -r2+r1;
z4 = -r3+r2;

ydot = [z1; z2; z3; z4;];

y0 = [30.0*10^-6;10.2*10^-6;4.1*10^-6;6.7]

µ±[a b c]=[100 5 20]ʱ
t=[0, 10, 20, 30, 40]
y(1)=[30.0*10^-6, 17.5*10^-6, 15*10^-6, 14*10^-6, 13.5*10^-6 ]

µ±[a, b, c]=[120, 15, 25]ʱ
t=[0 10 20 30 40]
y(1)=[30.0*10^-6, 12.5*10^-6, 10*10^-6, 8*10^-6, 7*10^-6 ]

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