Provided is a novel compound having an excellent suppression effect against arrhythmia including atrial fibrillation and being useful as a pharmaceutical product without antiviral effect. Disclosed is a compound represented by the following General Formula (I), a pharmaceutically acceptable salt thereof, or a solvate thereof (in the formula, the dotted line portion represents a single bond or a double bond； R1 represents an optionally substituted C1-6 alkyl group； Q represents an oxygen atom, a sulfur atom, or NR5； R2 represents -CHR6R7 or -CH2OR8； and R3 and R4, which may be identical or different, each represent an amino group, an azide group, or -X-R9, with the proviso that any one of R3 and R4 is an amino group) .
