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+FROM python:3.11-slim
+
+# System dependencies
+RUN apt-get update && apt-get install -y \
+    build-essential \
+    git \
+    python3-dev \
+    libboost-all-dev \
+    cmake \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install RDKit (official wheels)
+RUN pip install --upgrade pip && pip install rdkit-pypi
+
+# Set workdir
+WORKDIR /app
+
+# Copy code
+COPY . .
+
+# Install Python dependencies
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Set environment variables for HuggingFace Spaces
+ENV PORT=7860
+ENV LOG_LEVEL=info
+ENV ALLOWED_ORIGINS="*"
+
+# Expose port for Spaces
+EXPOSE 7860
+
+# Start FastAPI server (Spaces expects python main.py)
+CMD ["python", "main.py"]