jckspc has the following in thir glossary:
Quote Originally Posted by jackspc.com
CAS No 122-87-2
Other names: p-Hydroxyphenylaminoacetic acid; p-hydroxyanilinoacetic acid; para-oxyphenyl glycin; para-oxyphenyl glycocoll; and a number of trade names (Athenon, Glycin, Iconyl, and Monazol).
Description: The very small thin plates, occurring as a white powder, are almost insoluble in water, acetone, alcohol, benzenc, chloroform, ether, ethyl acetate, and glacial acetic acid. A 3% sodium sulfite solution at 60F will dissolve almost 13% by weight of Glycin, thus the recommendation to add the sodium sulfite before the Glycin when making developer solutions.
Precautions: Avoid repeated or prolonged contact with this compound as kidney damage has been reported from persistent contact. Keep container closed and use with adequate ventilation. Do not breathe dust or swallow, Wear safety glasses or rubber gloves when handling and wash thoroughly after handling.
First Aid: In case of contact, flush the eyes or skin with plenty of water. If swallowed, induce vomiting by giving a glass of lukewarm salty water (2 teaspoonfuls of table salt to one glass of water). Call a physician.
So maybe you need to make a sulfite solution first to dilute glycin.