Abstract: The present invention relates to promoters for differentiation into chondrocytes, chondrocyte proliferation promoter, and cartilaginous matrix production promoter, each containing a glycoside of liquiritigenin. According to the present invention, promoters for differentiation into chondrocytes, promoters for proliferation of chondrocytes, and promoters for cartilaginous matrix production, that are superior in the stability and safety, have a superior promoting action on differentiation into chondrocytes, a superior promoting action on proliferation of chondrocytes, and a superior promoting action on cartilaginous matrix production, and effective for regeneration of cartilage and further, prophylaxis or improvement of symptoms and diseases caused by the damage and inflammation of cartilage, or symptoms and diseases showing the loss of cartilage such as osteoarthritis and the like.

Abstract: The present invention provides a preventing or improving agent that can favorably promote bone formation, is effective in preventing or improving osteoporosis or a decrease in bone strength, has high safety, and is suitable for long-term continuous ingestion or administration, by forming a bone remodeling accelerator comprising one or more kinds selected from the group consisting of flavanone and a glycoside thereof.

Abstract: The present invention provides a preventing or improving agent that can favorably promote bone formation, is effective in preventing or improving osteoporosis or a decrease in bone strength, has high safety, and is suitable for long-term continuous ingestion or administration, by forming a bone remodeling accelerator comprising one or more kinds selected from the group consisting of flavanone and a glycoside thereof.

Abstract: The present invention provides a compound represented by the formula (I): or a salt thereof; and a method of quantitatively analyzing an amino group-containing target substance, including labeling a target substance in samples by using, as a labeling compound, two or more of such compounds having a mutually different mass due to isotope labeling, to confer a mass difference to the target substance between two or more samples, and the like.