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'then': [100], 'calix[4]pyrrole': [101], 'under': [102], 'cyclization': [104], 'conditions.': [105], 'present': [107], 'results': [108], 'help': [109], 'explain': [110], 'absence': [112], 'naturally': [114], 'occurring': [115], 'three-pyrrole': [116], 'fact': [120], 'they': [122], 'not': [124], 'observed': [125], 'as': [126], 'products': [127], 'or': [128], 'intermediate': [129], 'during': [130], 'classic': [131], 'syntheses.': [133]}, 'cited_by_api_url': 'https://api.openalex.org/works?filter=cites:W3186501602', 'counts_by_year': [{'year': 2024, 'cited_by_count': 8}, {'year': 2023, 'cited_by_count': 17}, {'year': 2022, 'cited_by_count': 9}, {'year': 2021, 'cited_by_count': 3}], 'updated_date': '2024-12-25T12:23:28.225435', 'created_date': '2021-08-02'}