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We aim to reveal the chemistry of carbon-chain molecules in high-massstar-forming regions from molecular level to chemical evolution, applying themethods established in low-mass star-forming regions. In this proceeding, wesummarize the topic about the main formation pathway of HC3N. We carried outobservations of three 13C isotopologues of HC3N toward a hot core G28.28-0.36with the 45-m radio telescope of the Nobeyama Radio Observatory. From theobservational results, we propose that the main formation pathway of HC3N isthe neutral-neutral reaction between C2H2 and CN. We also compare the resultsamong the different star-forming regions, from a low-mass starless core to ahigh-mass star-forming core.

Chemistry of Carbon-Chain Molecules in Star Forming Regions - Formation Pathway of HC3N in G28.28-0.36 Hot Core -