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An unbiased spectral line survey toward a solar-type Class 0/I protostar,IRAS04368+2557, in L1527 has been carried out in the 3 mm band with theNobeyama 45 m telescope. L1527 is known as a warm carbon-chain chemistry (WCCC)source, which harbors abundant unsaturated organic species such as C$_n$H ($n =3,\ 4,\ 5,\ldots$) in a warm and dense region near the protostar. Theobservation covers the frequency range from 80 to 116 GHz. A supplementaryobservation has also been conducted in the 70 GHz band to observe fundamentaltransitions of deuterated species. In total, 69 molecular species areidentified, among which 27 species are carbon-chain species and their isomers,including their minor isotopologues. This spectral line survey provides us witha good template of the chemical composition of the WCCC source.

An unbiased spectral line survey observation toward the low-mass star-forming region L1527