The present invention concerns a compound of formula (I), wherein R1 is H or an organic moiety, said compound of formula (I) having a biocarbon content equal to or higher than 20%.

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Provided are a fluorescent probe, a preparation method therefor and a use thereof. The fluorescent probe responds to viscosity sensitively and specifically, can be used for the specific fluorescence labeling of proteins and can also be used in the quantification, detection or kinetic study of proteins and the imaging of cells, tissues and living bodies.

Provided are a fluorescent probe, a preparation method therefor and a use thereof. The fluorescent probe responds to viscosity sensitively and specifically, can be used for the specific fluorescence labeling of proteins and can also be used in the quantification, detection or kinetic study of proteins and the imaging of cells, tissues and living bodies.

An object of the present invention is to provide an aldehyde compound and an ester compound that both have difluoro at the -position, a double bond or epoxy at the -position, and a disubstituted alkene at the -position. Provided are difluoroaldehyde, epoxy, and derivatives thereof.

An object of the present invention is to provide an aldehyde compound and an ester compound that both have difluoro at the -position, a double bond or epoxy at the -position, and a disubstituted alkene at the -position. Provided are difluoroaldehyde, epoxy, and derivatives thereof.