What is the reactant of the following reaction sequence? 
Definitions:
Ph.D. at Harvard
A doctoral degree awarded by Harvard University, signifying high-level achievement and research competence in a specific field of study.
Mary Salter Ainsworth
An American-Canadian developmental psychologist known for her work in early emotional attachment theory, particularly for the development of the "Strange Situation" assessment.
Elizabeth Loftus
A cognitive psychologist famous for her work on the malleability of human memory and the misinformation effect, especially in the context of eyewitness testimony.
Mary Whiton Calkins
An influential American psychologist who became the first woman to serve as president of the American Psychological Association in 1905.
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