Source code:
@Grab(group='org.openscience.cdk', module='cdk-bundle', version='2.9')
import org.openscience.cdk.interfaces.*;
import org.openscience.cdk.*;
mol = new AtomContainer();
mol.addAtom(new Atom("C"));
mol.addAtom(new Atom("H"));
mol.addAtom(new Atom("H"));
mol.addAtom(new Atom("H"));
mol.addAtom(new Atom("H"));
mol.addBond(0,1,IBond.Order.SINGLE);
mol.addBond(0,2,IBond.Order.SINGLE);
mol.addBond(0,3,IBond.Order.SINGLE);
mol.addBond(0,4,IBond.Order.SINGLE);
Output: