Is N-(4-(2-(2-Amino-3,4-dihydro-4-oxo-7H-pyrrolo(2,3-d)pyrimdin-5-yl)ethyl)benzoyl)glutamic acid Safe in Breastfeeding

I am a breastfeeding mother and i want to know if it is safe to use N-(4-(2-(2-Amino-3,4-dihydro-4-oxo-7H-pyrrolo(2,3-d)pyrimdin-5-yl)ethyl)benzoyl)glutamic acid? Is N-(4-(2-(2-Amino-3,4-dihydro-4-oxo-7H-pyrrolo(2,3-d)pyrimdin-5-yl)ethyl)benzoyl)glutamic acid safe for nursing mother and child? Does N-(4-(2-(2-Amino-3,4-dihydro-4-oxo-7H-pyrrolo(2,3-d)pyrimdin-5-yl)ethyl)benzoyl)glutamic acid extracts into breast milk? Does N-(4-(2-(2-Amino-3,4-dihydro-4-oxo-7H-pyrrolo(2,3-d)pyrimdin-5-yl)ethyl)benzoyl)glutamic acid has any long term or short term side effects on infants? Can N-(4-(2-(2-Amino-3,4-dihydro-4-oxo-7H-pyrrolo(2,3-d)pyrimdin-5-yl)ethyl)benzoyl)glutamic acid influence milk supply or can N-(4-(2-(2-Amino-3,4-dihydro-4-oxo-7H-pyrrolo(2,3-d)pyrimdin-5-yl)ethyl)benzoyl)glutamic acid decrease milk supply in lactating mothers?

Most sources consider breastfeeding to be contraindicated during maternal high-dose antineoplastic drug therapy. The manufacturer recommends that mothers should not to breastfeed during treatment with N-(4-(2-(2-Amino-3,4-dihydro-4-oxo-7H-pyrrolo(2,3-d)pyrimdin-5-yl)ethyl)benzoyl)glutamic acid and for one week after the last dose. Chemotherapy may adversely affect the normal microbiome and chemical makeup of breastmilk.[1] Women who receive chemotherapy during pregnancy are more likely to have difficulty nursing their infant.[2]