Luminogenic and fluorogenic compounds and methods to detect molecules or conditions

A compound represented by the following general formula (I) or a salt thereof:

• wherein
• R1 and R2 independently represent hydrogen, a C1-6alkyl group which may be substituted, or a group represented by formula (A):
• wherein X1 and X2 independently represent hydrogen or —N(R3)(R4), wherein R3 and R4 independently represent hydrogen a C1-6 alkyl group which may be substituted, a C1-6 alkylcarbonyl group which may be substituted, or a C1-6 alkoxycarbonyl group which may be substituted;
• and
• n represents an integer of 1 to 6;
• provided that R1 and R2 do not simultaneously represent hydrogen.