def get_sdf(identifier, namespace='cid', domain='compound',operation=None, searchtype=None, **kwargs):
    """Request wrapper that automatically parses SDF response and supresses NotFoundError."""
    try:
        return get(identifier, namespace, domain, operation, 'SDF', searchtype, **kwargs).decode()
    except NotFoundError as e:
        log.info(e)
        return None
Request wrapper that automatically parses SDF response and supresses NotFoundError.