Not a DOI
The resolution service at https://doi.org resolves DOIs. You have attempted to resolve articles/cas-redirect/1:CAS:528:DC+D2MXovFem, which is not a DOI.
articles/cas-redirect/1:CAS:528:DC+D2MXovFem may be a Handle (DOIs are a special sort of Handle). If articles/cas-redirect/1:CAS:528:DC+D2MXovFem is a valid Handle you should be able to resolve it at https://hdl.handle.net.
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