| abstract |
A polyaminedithiol compound of the formula:n wherein R₁, R₂, R₁₁ and R₁₂ are each a lower alkyl group, R₂₁ is a hydrogen atom or a lower alkyl group, and R₃ and R₁₃ are each a hydrogen atom or a nitrogen-containing organic group, provided that at least one of R₃ and R₁₃ is a nitrogen-containing organic group, which is used for imaging of the regional cerebral blood flow. |