We systematically analyze the flavor color spin structure of the pentaquark $q^4bar{Q}$ system in a constituent quark model based on the chromomagnetic interaction in both the SU(3) flavor symmetric and SU(3) flavor broken case with and without charm quarks. We show that the originally proposed pentaquark state $bar{Q}s qqq$ by Gignoux et al and by Lipkin indeed belongs to the most stable pentaquark configuration, but that when charm quark mass correction based on recent experiments are taken into account, a doubly charmed antistrange pentaquark configuration ($udc c bar{s}$) is perhaps the only flavor exotic configuration that could be stable and realistically searched for at present through the $Lambda_c K^+ K^- pi^+$ final states. The proposed final state is just reconstructing $K^+$ instead of $pi^+$ in the measurement of $Xi^{++}_{cc} rightarrow Lambda_c K^- pi^+ pi^+$ reported by LHCb collaboration and hence measurable immediately.
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