Update app.py

app.py

@@ -15,9 +15,9 @@ The output should be in JSON format with the following structure:
     "step 1": {
         "reactants": ["reactant 1", "reactant 2"],
         "products": ["product 1", "product 2"],
-        "reason": "Describe the reason or logic behind this step",
+        "reason": "Describe the reason or logic or mechanism that caused this step to happen",
         "reagent": "Optional reagent or conditions for this step",
-        "conditions": "Environmental conditions like temperature and pressure for this step"
+        "conditions": "Optional environmental conditions like temperature and pressure for this step"
     },
     "step 2": { ... }
     ...