[chemical substances] compounds Class nucleic acids [[─P(=O)(OH)OCH2CH(O~)CH(O─)CH(Y)CH(base)~]n (Y=H or OH)] 1 Class ribonucleic acids [[─P(=O)(OH)OCH2CH(O~)CH(O─)CH(OH)CH(base)~]n] 2 Class deoxyribonucleic acids [[─P(=O)(OH)OCH2CH(O~)CH(O─)CH2CH(base)~]n]