Abstract
We briefly review the formation of pion-mediated heavy-light exotic molecules with both charm and bottom, under the general structures of chiral and heavy quark symmetries. The charm isosinglet exotic molecules with [Formula: see text] binds, which we identify as the reported neutral [Formula: see text]. The bottom isotriplet exotic with [Formula: see text] binds, and is identified as a mixed state of the reported charged exotics [Formula: see text] and [Formula: see text]. The bound bottom isosinglet molecule with [Formula: see text] is a possible neutral [Formula: see text] to be observed.
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