Abstract: A resin composition for optical stereolithography including a cation-polymerizable organic compound (A), a radical polymerizable organic compound (B), a cationic polymerization initiator (C) and a radical polymerization initiator (D), wherein the cationic polymerization initiator (C) is an aromatic sulfonium compound (C-1) represented by the following general formula (C-1): wherein R1, R2, and R3 represent a monovalent organic group, Rf represents a fluoroalkyl group, m is the same number as the cationic charge of the “cation [S+(R1)(R2)(R3)]”, and n is an integer in a range of 0 to 6. The resin composition also includes an aromatic thiol compound (E) represented by the following general formula (E): R4SH)p??(E) wherein, R4 represents a mono- or di-valent aromatic hydrocarbon which may optionally have a substituent, and p is an integer of 1 or 2.

Abstract: A resin composition for optical stereolithography including a cation-polymerizable organic compound (A), a radical polymerizable organic compound (B), a cationic polymerization initiator (C) and a radical polymerization initiator (D) which is characterized by including, as a cationic polymerization initiator (C), an aromatic sulfonium compound (C-1) represented by the following general formula (C-1): (in the above general formula (C-1), R1, R2 and R3 represents a monovalent organic group, Rf represents a fluoroalkyl group, m is the same number as the cationic charge of the “cation [S+(R1) (R2) (R3)]”, n is an integer in the range of 0 to 6) as well as an aromatic thiol compound (E) represented by the following general formula (E): R4—(—SH)p ??(E) (wherein, R4 represents a mono- or di-valent aromatic hydrocarbon which may optionally have a substituent, p is an integer of 1 or 2.

Abstract: New isoquinoline derivatives and pharmaceutically acceptable acid addition salts represented by the following general formula (I) ##STR1## wherein Ar is an aromatic ring which may be substituted, and n shows 0, 1 or 2, have an inhibitory activity against apoptotic neuronal cell death. These compounds are useful for agents of prevention and treatment of neuronal neurodegenerative disorders such as Alzheimer's disease, Parkinson's disease, Huntington's chorea and amyotrophic lateral sclerosis, cerebral ischemic injury such as stroke, and peripheral neuropathy in diabetes mellitus.

Abstract: Particular hexahydropyrano [3,2-b] [1,4] benzothiazine derivatives represented by the following general formula (I) or pharmaceutically acceptable acid-addition salts thereof. ##STR1## The compounds can facilitate the metabolic turnover of inositol phospholipids at a hippocampus playing an important part in memory, and improve cerebral function leading the memory. The compounds can be utilized as agents for activating brain metabolism and improving cerebral function.