Ua pentòsa qu'ei un glucid de cinc carbònis. Que possedeishen tres centers quiraus (tres carbònis asimetrics) çò qui implica ueit esteroisomèrs (moleculas de medisha composicion e ostedent los medish grops quimics au medish lòc mes dab ua disposicion diferenta)
Los quate D-aldopentòsas que son:
CH=O CH=O CH=O CH=O | | | | HC-OH HO-CH HC-OH HO-CH | | | | HC-OH HC-OH HO-CH HO-CH | | | | HC-OH HC-OH HC-OH HC-OH | | | | CH2OH CH2OH CH2OH CH2OH D-Ribòsa D-Arabinòsa D-Xilòsa D-Lixòsa
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