Polymers made up of a few (2-20) nucleotides. In molecular genetics, they refer to a short sequence synthesized to match a region where a mutation is known to occur, and then used as a probe (OLIGONUCLEOTIDE PROBES). (Dorland, 28th ed)
Oligonucleotide
D004952
Esters
Compounds derived from organic or inorganic acids in which at least one hydroxyl group is replaced by an –O-alkyl or another organic group. They can be represented by the structure formula RCOOR’ and are usually formed by the reaction between an acid and an alcohol with elimination of water.
Ester
D000080
Acetals
Diethers with the structure -C(OR'')(OR'''), where R'' and R''' are not hydrogen. Mixed acetals have R'' and R''' groups which differ.
Acetal
D012265
Ribonucleotides
Nucleotides in which the purine or pyrimidine base is combined with ribose. (Dorland, 28th ed)