Use of at least one compound selected from the group consisting of the following compounds for reducing an odor of a pyrazine derivative: 2-ethyl-4-(2,2,3-trimethyl-3-cyclopenten-1-yl)-2-buten-1-ol; 5-methyl-2-(1-methylethyl)-phenol; 3,7-dimethyl-2,6-octadienal; phenylethyl salicylate; 1-(5,6,7,8-tetrahydro-3,5,5,6,8,8-hexamethyl-2-naphthalenyl)-ethanone; isolongifolanone; 4-(2,6,6-trimethyl-2-cyclohexen-1-yl)-3-buten-2-one (α-ionone); 4-(2,6,6-trimethyl-1-cyclohexen-1-yl)-3-buten-2-one (β-ionone); vetiverol; 7-acetyl-1,2,3,4,5,6,7,8-octahydro-1,1,6,7-tetramethyl-naphthalene; α-amylcinnamic aldehyde; α-methyl-4-(1-methylethyl)-benzenepropanal; 4-methyl-3-decen-5-ol; 1-(2-tert-butylcyclohexyloxy)-2-butanol; 2-methoxy-1-(phenylmethoxy)-4-(1-propenyl)-benzene; α-methyl-β-(p-tert-butylphenyl)-propionaldehyde; 1(-)-menthol; ω-6-hexadecenelactone; 2-(2-(4-methyl)-3-cyclohexen-1-yl)-propylcyclopentanone; formaldehyde cyclododecyl ethyl acetal; 1-(2,3,4,7,8,8a-hexahydro-3,6,8,8-tetramethyl-1H-3a,7-methanoazulen-5-yl)-ethanone; β-methyl naphthyl ketone; cedryl acetate; -3-methylcyclopenta-5-decen-1-one; cinnamaldehyde; 4-(1-ethoxyvinyl)-3,3,5,5-tetramethylcyclohexanone; α-hexylcinnamic aldehyde; 2-phenylpropionaldehyde; 3,7-dimethyl-6-octenal; dodecahydro-3a,6,6,9a-tetramethylnaphtho[2,1-b]furan; 4,7,7-trimethyl-spirobicyclo[2.2.1]heptane-2,1-cyclopentan-3-one; α-isomethyl ionone; 3,7-dimethyl-1-octanol; cedryl methyl ether; muscone; 2-methyl-4-(2,2,3-trimethyl-3-cyclopenten-1-yl)-2-buten-1-ol; 2-cyclohexylpropanal; γ-undecalactone; cyclopentadecanolide; 1-(2,6,6-trimethyl-1,3-cyclohexadien-1-yl)-2-buten-1-one; 2,4-dimethyl-3-cyclohexene-1-carboxyaldehyde; 2,4,6-trimethyl-3-cyclohexene-1-carboxyaldehyde; 3,5,6-trimethyl-3-cyclohexene-1-carboxyaldehyde; 6,10-dimethyl-3-oxa-9-undecenal; dimethyl benzyl carbinyl acetate; ethyl-(3aα,4α,7α,3aα)-octahydro-4,7-methano-3aH-indene-3a-carboxylate; 2-pentyl-3-methyl-2-cyclopenten-1-one; phenylhexanol; 1-(5,5-dimethyl-1-cyclohexen-1-yl)-4-penten-1-one; 6-tert-butyl-1,1-dimethylinden-4-yl methyl ketone; cis-4-isopropylcyclohexylmethanol; 1-allyl-3-methoxy-4-hydroxybenzene; -3,7-dimethyl-2,6-octadien-1-ol; 4-tert-butyl-2,6-dimethyl-3,5-dinitroacetophenone; 1,4-dioxacycloheptadecane-5,17-dione; hexyl salicylate; and α-methyl-3,4-methylenedioxyhydrocinnamic aldehyde, wherein the pyrazine derivative is a compound represented by the following Formula: wherein R 1 represents methyl, ethyl, or acetyl; and R 2, R 3, and R 4 each independently represent hydrogen or methyl. 2-ethyl-4-(2,2,3-trimethyl-3-cyclopenten-1-yl)-2-buten-1-ol; 5-methyl-2-(1-methylethyl)-phenol; 3,7-dimethyl-2,6-octadienal; phenylethyl salicylate; 1-(5,6,7,8-tetrahydro-3,5,5,6,8,8-hexamethyl-2-naphthalenyl)-ethanone; isolongifolanone; 4-(2,6,6-trimethyl-2-cyclohexen-1-yl)-3-buten-2-one (α-ionone); 4-(2,6,6-trimethyl-1-cyclohexen-1-yl)-3-buten-2-one (β-ionone); vetiverol; 7-acetyl-1,2,3,4,5,6,7,8-octahydro-1,1,6,7-tetramethyl-naphthalene; α-amylcinnamic aldehyde; α-methyl-4-(1-methylethyl)-benzenepropanal; 4-methyl-3-decen-5-ol; 1-(2-tert-butylcyclohexyloxy)-2-butanol; 2-methoxy-1-(phenylmethoxy)-4-(1-propenyl)-benzene; α-methyl-β-(p-tert-butylphenyl)-propionaldehyde; 1(-)-menthol; ω-6-hexadecenelactone; 2-(2-(4-methyl)-3-cyclohexen-1-yl)-propylcyclopentanone; formaldehyde cyclododecyl ethyl acetal; 1-(2,3,4,7,8,8a-hexahydro-3,6,8,8-tetramethyl-1H-3a,7-methanoazulen-5-yl)-ethanone; β-methyl naphthyl ketone; cedryl acetate; -3-methylcyclopenta-5-decen-1-one; cinnamaldehyde; 4-(1-ethoxyvinyl)-3,3,5,5-tetramethylcyclohexanone; α-hexylcinnamic aldehyde; 2-phenylpropionaldehyde; 3,7-dimethyl-6-octenal; dodecahydro-3a,6,6,9a-tetramethylnaphtho[2,1-b]furan; 4,7,7-trimethyl-spirobicyclo[2.2.1]heptane-2,1-cyclopentan-3-one; α-isomethyl ionone; 3,7-dimethyl-1-octanol; cedryl methyl ether; muscone; 2-methyl-4-(2,2,3-trimethyl-3-cyclopenten-1-yl)-2-buten-1-ol; 2-cyclohexylpropanal; γ-undecalactone; cyclopentadecanolide; 1-(2,6,6-trimethyl-1,3-cyclohexadien-1-yl)-2-buten-1-one; 2,4-dimethyl-3-cyclohexene-1-carboxyaldehyde; 2,4,6-trimethyl-3-cyclohexene-1-carboxyaldehyde; 3,5,6-trimethyl-3-cyclohexene-1-carboxyaldehyde; 6,10-dimethyl-3-oxa-9-undecenal; dimethyl benzyl carbinyl acetate; ethyl-(3aα,4α,7α,3aα)-octahydro-4,7-methano-3aH-indene-3a-carboxylate; 2-pentyl-3-methyl-2-cyclopenten-1-one; phenylhexanol; 1-(5,5-dimethyl-1-cyclohexen-1-yl)-4-penten-1-one; 6-tert-butyl-1,1-dimethylinden-4-yl methyl ketone; cis-4-isopropylcyclohexylmethanol; 1-allyl-3-methoxy-4-hydroxybenzene; -3,7-dimethyl-2,6-octadien-1-ol; 4-tert-butyl-2,6-dimethyl-3,5-dinitroacetophenone; 1,4-dioxacycloheptadecane-5,17-dione; hexyl salicylate; and α-methyl-3,4-methylenedioxyhydrocinnamic aldehyde, wherein the pyrazine derivative is a compound represented by the following Formula: wherein R 1 represents methyl, ethyl, or acetyl; and R 2, R 3, and R 4 each independently represent hydrogen or methyl. wherein R 1 represents methyl, ethyl, or acetyl; and R 2, R 3, and R 4 each independently represent hydrogen or methyl.