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Recent developments in (sub-)millimeter facilities have drastically changedthe amount of information obtained from extragalactic spectral scans. In thispaper, we present a feature extraction technique using principal componentanalysis (PCA) applied to arcsecond-resolution (1.0-2.0 arcsec = 72-144 pc)spectral scan datasets for the nearby type-2 Seyfert galaxy, NGC 1068, usingBand 3 of the Atacama Large Millimeter/submillimeter Array. We apply PCA to 16well-detected molecular line intensity maps convolved to a common 150 pcresolution. In addition, we include the [SIII]/[SII] line ratio and [CI]$^3P_1$-$^3P_0$ maps in the literature, both of whose distributions showremarkable resemblance with that of a kpc-scale biconical outflow from thecentral AGN. We identify two prominent features: (1) central concentration atthe circumnuclear disk (CND) and (2) two peaks across the center that coincidewith the biconical outflow peaks. The concentrated molecular lines in the CNDare mostly high-dipole molecules (e.g., H$^{13}$CN, HC$_3$N, and HCN). Lineemissions from molecules known to be enhanced in irradiated interstellarmedium, CN, C$_2$H, and HNC, show similar concentrations and extendedcomponents along the bicone, suggesting that molecule dissociation is adominant chemical effect of the cold molecular outflow of this galaxy. Althoughfurther investigation should be made, this scenario is consistent with thefaintness or absence of the emission lines from CO isotopologues, CH$_3$OH, andN$_2$H$^+$, in the outflow, which are easily destroyed by dissociating photonsand electrons.

AGN-driven Cold Gas Outflow of NGC 1068 Characterized by Dissociation-Sensitive Molecules