A suitable representation of compound classes has been given by David Weininger by logical expressions in the SMARTS notation [22] that allow to precisely define structural elements that shall or shall not be present in compounds belonging to an assigned compound class.
Inorganic filler particles in dental composites can leach ions from compounds of silicon, barium, strontium, and sodium (Soderholm 1981, 1983; Soderholm et al. 1984), but it is also likely that those detected elements actually could be present in compounds such as silicates and carbonates that do have IR-detectable covalent bonds.
Yet, it is present in Compound as CID 14123361 with the corresponding SIDs 137126462 and 143067637.
Subsequently, 8808 SSR sequences were found in 7441 unigenes of which 1120 unigenes contained more than one SSR sequence and 507 SSR sequences were present in compound formations.
At R2 position hydrogen bond acceptor is disfavored (red polyhedral); at this position an alkyl chain is present in compound 32.
PubChem standardization can modify an atom environment, decreasing the number of times the pre-standardization environment is present in Compound, or even eliminating it in favor of an alternative, but equivalent, representation.
Interestingly, a high proportion of SSRs (43%) were present in compound formation.
The present version of the database contains 1 738 669 simple sequence repeats of which 181 s756 repeats are present in compound form.
A total of 373 sequences contained more than one SSR and 219 SSRs were present in compound forms.
Of all the SSR containing unigenes, 2,918 sequences contained more than one SSR, and 1,207 SSRs were present in compound form.
