D prefix

Figure 3. Single topology definition for compound JG365 and JG365A. The chemical symbols with the D prefix indicate dummy atoms and X=Ac-Ser-Leu-Asn-(Phe-Hea-Pro)...

Remember that sequences are always written in the 5 - 3 direction, from left to right. The 3 terminus is therefore phosphorylated. The sugar present is D-ribose because there is no d prefix to indicate that it is a deoxy tetranucleotide. Thus, the structure is as shown below. 

L-isomer. Compare with D-Prefix used to designate a levorotatory enantiomer. 

D. (D-) Prefix indicating the right-handed enantiomer of an optical isomer. Usually printed as a small capital letter. 

Simple sugars such as glucose are optical isomers, as indicated by the "d" prefix in D-glucose. 

For compounds with identical stem names, ranking is determined by the alphabetical position of the prefix bromo, ethyl, fluoro, hydroxy, methyl, etc. Where there is more than one prefix, that which begins with the letter closest to a determines the rank of the compound. Designations such as and are Ignored for this purpose, e. g., dihydroxy is an h prefix, not a d prefix. For compounds with identical prefixes and stem names, the order is determined by the position of the lowest-numbered substitutent, e.g., lQ -hydroxy-4-pregnene-3,20-dione precedes 6 -hydroxy-4-pregnene-3,20-dione. For identically positioned substituents a always precedes /3. 

Question 10. Eemembering that (see pp. 56-58) lowest numbers are assigned, in sequence as far as necessary, to (a) the principal fimctional group, (5) a double bond, (c) a triple bond, (d) prefixes considered together as a series of numbers, and (e) prefixes cited first in alphabetical order, number the following compounds ... 

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