What would be the reactant in the following reaction sequence? 
Definitions:
NEC
Short for Necrotizing Enterocolitis, a serious gastrointestinal disease affecting mostly premature infants, involving inflammation and tissue death in the intestines.
Not Elsewhere Classified
A term used in various categorization systems to label items that do not fit into the existing categories.
Obstetric Care
Medical care and treatment provided to women during pregnancy, childbirth, and the postpartum period.
ICD-10
The 10th revision of the International Statistical Classification of Diseases and Related Health Problems, a medical classification list by the World Health Organization.
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