test(){
    dosepoint(Aa)
    C = A1 / V
    deriv(Aa =  -  Ka * Aa)
    deriv(A1 =  Ka * Aa  -  Cl * C)
    error(CEps=1)
    observe(CObs=C + CEps)
    stparm(Ka = tvKa * exp(nKa))
    stparm(V = tvV * exp(nV))
    stparm(Cl = tvCl * exp(nCl))
    fixef( tvKa = c(,1,))
    fixef( tvV = c(,1,))
    fixef( tvCl = c(,1,))
    ranef(diag(nKa,nV,nCl) =  c(1,1,1))
}
