5-oxoproline

The garden strawberry (or simply strawberry; Fragaria × ananassa) is a widely grown hybrid species of the genus Fragaria (collectively known as the strawberries). It is cultivated worldwide for its fruit. The fruit (which is not a botanical berry, but an aggregate accessory fruit) is widely appreciated for its characteristic aroma, bright red color, juicy texture, and sweetness. It is consumed in large quantities, either fresh or in such prepared foods as preserves, fruit juice, pies, ice creams, milkshakes, and chocolates. Artificial strawberry aroma is also widely used in many industrial food products. As strawberry flavor and fragrance are popular characteristics for consumers,they are used widely in a variety of manufacturing, including foods, beverages, confections, perfumes and cosmetics. Sweetness, fragrance and complex flavor are favorable attributes. In plant breeding and farming, emphasis is placed on sugars, acids, and volatile compounds, which improve the taste and fragrance of a ripe strawberry. Esters, terpenes, and furans are chemical compounds having the strongest relationships to strawberry flavor and fragrance, with a total of 31 volatile compounds significantly correlated to favorable flavor and fragrance [Wikipedia]