Please have a look on this issue : ethereum.stackexchange.com/questions/42122/declar…
Getting error : browser/mycontract.sol:64:27: DeclarationError: Identifier not found or not unique. contract StandardToken is ERC20, BasicToken { ^---^
browser/mycontract.sol:64:34: DeclarationError: Identifier not found or not unique. contract StandardToken is ERC20, BasicToken { ^---^