그러나 Fig. 2의 X선 결과에서 알 수 있듯이, 구리 옥살산과 구리만이 발견되었고, 식 2에 나타난 생성물은 확인되지 않았다.
However, as can be seen from the X-ray results in Figure 2, only copper oxalic acid and copper were found, and the product shown in equation 2 was not.