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- Identify if the following structure is enantiomer or diastereomers and explain whyMost naturally occurring amino acids have chiral centers (the asymmetric a carbon atoms)that are named (S) by the Cahn–Ingold–Prelog convention (Section 5-3). The commonnaturally occurring form of cysteine has a chiral center that is named (R), however.(a) What is the relationship between (R)-cysteine and (S)-alanine? Do they have the oppositethree-dimensional configuration (as the names might suggest) or the same configuration?(b) (S)-Alanine is an l-amino acid (Figure 24-2). Is (R)-cysteine a d-amino acid or anl-amino acid?Draw the different stereoisomers that CH3CHClCH2CHOHCH3 presents, and indicate the isomeric relationship between them (enantiomers, diastereoisomers or meso).
- Identify pairs of molecules that represent enantiomers and diastereomers and identify each center stereogenic by writing R or S next to it.Which configuration (R or S) does the bottom asymmetric carbon have for the d seriesof sugars? Which configuration for the l series?Draw the tetrapeptide represented by HLQS at physiological pH (pH=7.4), Include proper stereochemistry
- For each of the following pairs, indicate if they are (A) the same, (B) constitutional isomers, (C) enantiomers, or (D) diastereomersA student decided that the configuration of the asymmetric centers in a sugar such as d-glucose could be determined rapidly by simply assigning the R configuration to an asymmetric center with an OH group on the right and the S configuration to an asymmetric center with an OH group on the left. Is he correct?Calculate the degrees of unsaturation for C17H23NO3 and draw three (3) possible structures.