Here's a breakdown:

* Haemoglobin: Fischer was the first to determine the structure of haemoglobin, the protein in red blood cells that carries oxygen throughout the body. He established that haemoglobin consists of a protein component (globin) and a non-protein component called heme.

* Chlorophyll: He also made significant contributions to understanding the structure of chlorophyll, the pigment in plants responsible for photosynthesis. He was able to isolate and characterize the key components of chlorophyll, including its porphyrin ring structure.

* Synthesis of Haematin: Fischer's most groundbreaking achievement was the synthesis of haematin, a derivative of heme. This was a major breakthrough in understanding the chemical structure of these vital molecules.

His work laid the foundation for future research in biochemistry and helped us understand fundamental processes like oxygen transport and photosynthesis.