Trisulfide compound and clathrate thereof

A compound represented by Formula (3):

• wherein R4 is
• a C1-6 alkyl group having one or more substituents selected from the group consisting of a carboxy group and —OR5,
• a C2-6 alkyl group having one or more substituents selected from the group consisting of —NR6R7 and —N+R9R10R11, or
• —(CH2CH2O)nR8,
• wherein R5, R6, R7, R8, R9, R10, and R11 are each independently a hydrogen atom or a C1-3 alkyl group, and
• n is an integer of 2 to 5.

A cyclodextrin clathrate comprising a cyclodextrin and a compound selected from the group consisting of

• (a) a compound represented by Formula (1):
• (b) a compound represented by Formula (2):
• and
• (c) a salt of the compound represented by Formula (2),
• wherein
• R1 and R2 are each independently
• a hydrogen atom,
• a C1-6 alkyl group optionally having one or more substituents selected from the group consisting of a carboxy group and —OR5,
• a C2-6 alkyl group having one or more substituents selected from the group consisting of —NR6R7 and —N+R9R10R11, or
• —(CH2CH2O)nR8,
• R3 is
• a hydrogen atom,
• a C1-6 alkyl group optionally having one or more substituents selected from the group consisting of a carboxy group and —OR5,
• a C2-6 alkyl group having one or more substituents selected from the group consisting of —NR6R7 and —N+R9R10R11, or
• —(CH2CH2O)nR8,
• R5, R6, R7, R8, R9, R10, and R11 are each independently a hydrogen atom or a C1-3 alkyl group, and
• n is an integer of 2 to 5.