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We have analyzed Atacama Large Millimeter/submillimeter Array (ALMA) Cycle 4Band 6 data toward two young stellar objects (YSOs), Oph-emb5 and Oph-emb9, inthe Ophiuchus star-forming region. The YSO Oph-emb5 is located in a relativelyquiescent region, whereas Oph-emb9 is irradiated by a nearby bright Herbig Bestar. Molecular lines from $cyclic$-C$_{3}$H$_{2}$ ($c$-C$_{3}$H$_{2}$),H$_{2}$CO, CH$_{3}$OH, $^{13}$CO, C$^{18}$O, and DCO$^{+}$ have been detectedfrom both sources, while DCN is detected only in Oph-emb9. Around Oph-emb5,$c$-C$_{3}$H$_{2}$ is enhanced at the west side, relative to the IR source,whereas H$_{2}$CO and CH$_{3}$OH are abundant at the east side. In the field ofOph-emb9, moment 0 maps of the $c$-C$_{3}$H$_{2}$ lines show a peak at theeastern edge of the field of view, which is irradiated by the Herbig Be star.Moment 0 maps of CH$_{3}$OH and H$_{2}$CO show peaks farther from the brightstar. We derive the $N$($c$-C$_{3}$H$_{2}$)/$N$(CH$_{3}$OH) column densityratios at the peak positions of $c$-C$_{3}$H$_{2}$ and CH$_{3}$OH near eachYSO, which are identified based on their moment 0 maps. The$N$($c$-C$_{3}$H$_{2}$)/$N$(CH$_{3}$OH) ratio at the $c$-C$_{3}$H$_{2}$ peak issignificantly higher than at the CH$_{3}$OH peak by a factor of $\sim 19$ inOph-emb9, while the difference in this column density ratio between these twopositions is a factor of $\sim2.6 $ in Oph-emb5. These differences areattributed to the efficiency of the photon-dominated region (PDR) chemistry inOph-emb9. The higher DCO$^{+}$ column density and the detection of DCN inOph-emb9 are also discussed in the context of UV irradiation flux.

Chemical compositions in the vicinity of protostars in Ophiuchus