Schobert, Rainer et al. published their research in Tetrahedron in 2008 | CAS: 19444-23-6

Benzyl 2-hydroxy-2-methylpropanoate (cas: 19444-23-6) belongs to esters. Esters typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Computed Properties of C11H14O3

Tipranavir analogous 3-sulfonylanilidotetronic acids: new synthesis and structure-dependent anti-HIV activity was written by Schobert, Rainer;Stehle, Ralf;Walter, Hauke. And the article was included in Tetrahedron in 2008.Computed Properties of C11H14O3 This article mentions the following:

Sulfonamide-containing tetronic acids I [R1 = Me, Ph, R2 = Me, H, R1R2 = (CH2)5, R3 = H, F, Cl, Me], structural analogs of the HIV-1 protease inhibitor tipranavir, were synthesized in five steps including a microwave-assisted Claisen rearrangement of cinnamyl tetronates and a modified Charette cyclopropanation of the so-formed 3-allyltetronic acids. Compounds I with two non-H residues (R1, R2) at C-5 of the tetronate core exhibited structure-dependent antiviral activity in two HIV strains. Derivatives I (R1 = R2 = Me, R3 = Cl) and I [R1R2 = (CH2)5, R3 = Me] were most active (IC50<10 μM) in the sensitive strain HIVNL4-3. In the experiment, the researchers used many compounds, for example, Benzyl 2-hydroxy-2-methylpropanoate (cas: 19444-23-6Computed Properties of C11H14O3).

Benzyl 2-hydroxy-2-methylpropanoate (cas: 19444-23-6) belongs to esters. Esters typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Computed Properties of C11H14O3

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics