| Allowed Value | Details | 
|---|---|
| n | abbreviation for "no" | 
| no | the monomer is nonstandard | 
| y | abbreviation for "yes" | 
| yes | the monomer is standard | 
| Allowed Value | Details | 
|---|---|
| n | abbreviation for "no" | 
| no | the monomer is nonstandard | 
| y | abbreviation for "yes" | 
| yes | the monomer is standard |