R;S;E;Z;pro-R;pro-S
| Allowed Value | Details |
|---|---|
| E | (E)- alkene (German, entgegen = opposite) |
| N | atom is not a chiral center |
| R | rectus - right handed configuration |
| S | sinister - left handed configuration |
| Z | (Z)- alkene (German, zusammen = together) |
| pro-R | If substituted for a higher molecular weight entity will make the attached atom an R chiral center |
| pro-S | If substituted for a higher molecular weight entity will make the attached atom an S chiral center |
| Allowed Value | Details |
|---|---|
| E | (E)- alkene (German, entgegen = opposite) |
| N | atom is not a chiral center |
| R | rectus - right handed configuration |
| S | sinister - left handed configuration |
| Z | (Z)- alkene (German, zusammen = together) |
| pro-R | If substituted for a higher molecular weight entity will make the attached atom an R chiral center |
| pro-S | If substituted for a higher molecular weight entity will make the attached atom an S chiral center |