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Chemical diversity of low-mass protostellar sources has so far beenrecognized, and environmental effects are invoked as its origin. In thiscontext, observations of isolated protostellar sources without influences ofnearby objects are of particular importance. Here, we report chemical andphysical structures of the low-mass Class 0 protostellar source IRAS16544$-$1604 in the Bok globule CB68, based on 1.3 mm ALMA observations at aspatial resolution of $\sim$70~au that were conducted as part of the largeprogram FAUST. Three interstellar saturated complex organic molecules (iCOMs),CH$_3$OH, HCOOCH$_3$, and CH$_3$OCH$_3$, are detected toward the protostar. Therotation temperature and the emitting region size for CH$_3$OH are derived tobe $131\pm11$~K and $\sim$10~au, respectively. The detection of iCOMs in closeproximity to the protostar indicates that CB68 harbors a hot corino. Thekinematic structure of the C$^{18}$O, CH$_3$OH, and OCS lines is explained byan infalling-rotating envelope model, and the protostellar mass and the radiusof the centrifugal barrier are estimated to be $0.08-0.30$~$M_\odot$ and $< 30$au, respectively. The small radius of the centrifugal barrier seems to berelated to the small emitting region of iCOMs. In addition, we detect emissionlines of c-C$_3$H$_2$ and CCH associated with the protostar, revealing a warmcarbon chain chemistry (WCCC) on a 1000~au scale. We therefore find that thechemical structure of CB68 is described by a hybrid chemistry. The molecularabundances are discussed in comparison with those in other hot corino sourcesand reported chemical models.

Chemical and Physical Characterization of the Isolated Protostellar Source CB68: FAUST. IV