  In this paper we use the recently suggested conjecture about the integral
representation for the flat coordinates on Frobenius manifolds, connected with
the isolated singularities, to compute the flat coordinates and Saito primitive
form on the space of the deformations of Gepner chiral ring
$\widehat{SU}(3)_4$. We verify this conjecture comparing the expressions for
the flat coordinates obtained from the conjecture with the one found by direct
computation. The considered case is of a particular interest since together
with the relevant and marginal deformations it has one irrelevant deformation.
