We study a two-dimensional quaternary inhibitory system. This free energy
functional combines an interface energy favoring micro-domain growth with a
Coulomb-type long range interaction energy which prevents micro-domains from
unlimited spreading. Here we consider a limit in which three species are
vanishingly small, but interactions are correspondingly large to maintain a
nontrivial limit. In this limit two energy levels are distinguished: the
highest order limit encodes information on the geometry of local structures as
a three-component isoperimetric problem, while the second level describes the
spatial distribution of components in global minimizers. Geometrical
descriptions of limit configurations are derived.