Abstract: A method produces a hairpin single-stranded RNA molecule capable of inhibiting expression of a target gene, including the step of reacting a first single-stranded oligo-RNA molecule represented by formula (I) with a second single-stranded oligo-RNA molecule represented by formula (II) in a mixed solvent including a buffer solution and a hydrophilic organic solvent in the presence of a dehydration condensation agent: 5?-Xc-Lx1 . . . (I) and Lx2-X—Y-Ly-Yc-3? . . . (II), wherein the dehydration condensation agent is selected from the group consisting of a triazine-based dehydration condensation agent, a uronium-based dehydration condensation agent including an N-hydroxy nitrogen-containing aromatic ring structure, a carbodiimide-based dehydration condensation agent, a 2-halopyridinium-based dehydration condensation agent, and a formamidinium-based dehydration condensation agent.

Abstract: A method produces a hairpin single-stranded RNA molecule capable of inhibiting expression of a target gene, the method including: (i) an annealing step of annealing a first single-stranded oligoRNA molecule and a second single-stranded oligoRNA molecule; and (ii) a ligation step of ligating 3? end of the first single-stranded oligoRNA molecule and 5? end of the second single-stranded oligoRNA molecule by an Rnl2 family ligase, wherein a sequence produced by ligating the first single-stranded oligoRNA molecule and the second single-stranded oligoRNA molecule includes a gene expression-inhibiting sequence for the target gene.

Abstract: A method produces a hairpin single-stranded RNA molecule capable of inhibiting expression of a target gene, including the step of reacting a first single-stranded oligo-RNA molecule represented by formula (I) with a second single-stranded oligo-RNA molecule represented by formula (II) in a mixed solvent including a buffer solution and a hydrophilic organic solvent in the presence of a dehydration condensation agent: 5?-Xc-Lx1 (I) and Lx2-X—Y-Ly-Yc-3? (II), wherein the dehydration condensation agent is selected from the group consisting of a triazine-based dehydration condensation agent, a uronium-based dehydration condensation agent including an N-hydroxy nitrogen-containing aromatic ring structure, a carbodiimide-based dehydration condensation agent, a 2-halopyridinium-based dehydration condensation agent, and a formamidinium-based dehydration condensation agent.

Abstract: A method produces a hairpin single-stranded RNA molecule capable of inhibiting expression of a target gene, including the step of reacting a first single-stranded oligo-RNA molecule represented by formula (I) with a second single-stranded oligo-RNA molecule represented by formula (II) in a mixed solvent including a buffer solution and a hydrophilic organic solvent in the presence of a dehydration condensation agent: 5?-Xc-Lx1 (I) and Lx2-X—Y-Ly-Yc-3? (II), wherein the dehydration condensation agent is selected from the group consisting of a triazine-based dehydration condensation agent, a uronium-based dehydration condensation agent including an N-hydroxy nitrogen-containing aromatic ring structure, a carbodiimide-based dehydration condensation agent, a 2-halopyridinium-based dehydration condensation agent, and a formamidinium-based dehydration condensation agent.

Abstract: A method produces a hairpin single-stranded RNA molecule capable of inhibiting expression of a target gene, the method including: (i) an annealing step of annealing a first single-stranded oligoRNA molecule and a second single-stranded oligoRNA molecule; and (ii) a ligation step of ligating 3? end of the first single-stranded oligoRNA molecule and 5? end of the second single-stranded oligoRNA molecule by an Rnl2 family ligase, wherein a sequence produced by ligating the first single-stranded oligoRNA molecule and the second single-stranded oligoRNA molecule includes a gene expression-inhibiting sequence for the target gene.

Abstract: A compound has a guanidine skeleton that inhibits the protease activity of MALT1 and exerts a therapeutic or prophylactic effect on autoimmune disease such as psoriasis or allergic disease such as atopic dermatitis. The guanidine derivative is typified by the following formula or a pharmacologically acceptable salt thereof.

Abstract: A compound has inhibitory activity on Discoidin Domain Receptor 1. The compound includes a urea derivative represented by the formula below or a pharmaceutically acceptable salt thereof.

Abstract: A compound has a guanidine skeleton that inhibits the protease activity of MALT1 and exerts a therapeutic or prophylactic effect on autoimmune disease such as psoriasis or allergic disease such as atopic dermatitis. The guanidine derivative is typified by the following formula or a pharmacologically acceptable salt thereof.

Abstract: A compound has inhibitory activity on Discoidin Domain Receptor 1. A urea derivative is represented by the formula (I) or a pharmaceutically acceptable salt thereof: wherein, R1 is trifluoromethyl, trifluoromethoxy, or pentafluorosulfanyl; each R2 is independently a hydrogen atom or methyl which is optionally substituted by one hydroxyl or one saturated heterocyclyl having four to six ring-forming atoms; R3 is a hydrogen atom, halogen atom, C1-C3 alkyl, saturated heterocyclyl having four to six ring-forming atoms and optionally having an oxo group, or R5O—; and R4 is phenyl, pyridyl, pyridazinyl, or pyrimidinyl, which phenyl, pyridyl, pyridazinyl, or pyrimidinyl is optionally substituted by one R6.

Abstract: A compound has inhibitory activity on Discoidin Domain Receptor 1. The compound includes a urea derivative represented by the formula below or a pharmaceutically acceptable salt thereof.

Abstract: A compound has inhibitory activity on Discoidin Domain Receptor 1. A urea derivative is represented by the formula (I) or a pharmaceutically acceptable salt thereof: wherein, R1 is trifluoromethyl, trifluoromethoxy, or pentafluorosulfanyl; each R2 is independently a hydrogen atom or methyl which is optionally substituted by one hydroxyl or one saturated heterocyclyl having four to six ring-forming atoms; R3 is a hydrogen atom, halogen atom, C1-C3 alkyl, saturated heterocyclyl having four to six ring-forming atoms and optionally having an oxo group, or R5O—; and R4 is phenyl, pyridyl, pyridazinyl, or pyrimidinyl, which phenyl, pyridyl, pyridazinyl, or pyrimidinyl is optionally substituted by one R6.